Most students begin research by typing a topic into a general search engine. That instinct is understandable. Search engines are fast, familiar, and always available. But search engines are not libraries. They index a fraction of the scholarly record, they rank results by popularity and commercial relevance rather than research quality, and they do not organize knowledge in ways that make browsing and discovery easy or reliable.

This chapter teaches students how to use library catalogs and digital collections as primary research tools. Students will learn how catalog records work, how to search by title, author, and subject, how call numbers organize physical collections, how digital collections differ from open web sources, and how to move from a catalog record to actual source use. By the end of this chapter, students should be able to navigate a library catalog with confidence, interpret catalog records accurately, and connect what they find in a catalog to their larger research process.

A library catalog does something search engines cannot do: it gives you organized, described, and classified access to an institution's entire collection. It tells you not just that a book exists, but what the book is about, who wrote it, how it relates to other works on the same topic, whether it is available, and where to find it.

A library catalog is a database that describes and organizes the materials in a library's collection. Its primary function is to help users find items by providing searchable descriptions of everything the library holds.

Catalogs serve several distinct purposes simultaneously.

Modern library catalogs are almost always online and are often called Online Public Access Catalogs, or OPACs. Many libraries now use discovery systems that search the catalog and licensed databases simultaneously, which can be convenient but can also blur the distinction between catalog records and database records. Understanding what a catalog does — and how it differs from a database or search engine — helps you use each tool appropriately.

Every item in a library catalog has a catalog record — a structured description that identifies the item and makes it findable. Catalog records are created using a professional standard called MARC, which stands for Machine-Readable Cataloging. MARC defines specific fields for specific kinds of information, so that the same types of data appear in the same places across millions of records in thousands of libraries. This standardization is what makes it possible to search catalogs consistently and to share catalog records across institutions.

A well-read catalog record tells you a great deal about an item before you ever open it. Practicing the habit of reading full records — not just skimming titles — is one of the habits that distinguishes experienced researchers from beginning ones.

A library catalog offers several primary ways to search: by title, by author, by subject, and by keyword. Each approach has distinct strengths. Skilled researchers know which approach to use for which research situation.

A title search is most useful when you already know the specific item you are looking for. Enter the main words of the title rather than the full title with articles — searching for Origins of the Cold War works better than searching for The Origins of the Cold War. Title searches are not effective for exploratory research, because they only retrieve items with those specific words in the title field.

An author search is useful when you want to find other works by a scholar whose work you have already found useful. Author searches in most catalogs use an inverted format: last name, first name. Be aware that the catalog uses a standardized authority record for each author's name. Corporate authors — government agencies, organizations, universities — also appear in author fields.

Subject searching is the most powerful catalog search strategy for exploratory research. Subject headings are controlled vocabulary terms — standardized phrases assigned by catalogers to describe what an item is about. The Library of Congress Subject Headings (LCSH) is the most widely used system in academic libraries.

Most modern catalogs also offer keyword searching, which searches across multiple fields simultaneously — title, author, subject, notes, and sometimes summary. Keyword searching is flexible and forgiving, but it is less precise than subject searching because it retrieves items that contain your search terms anywhere in the record, regardless of whether those terms describe the item's main topic. Use keyword searching to get started, then refine by moving to subject headings once you find relevant items.

Every physical item in a library collection has a call number — an alphanumeric code that places the item in a specific location on the shelves. Call numbers do two things simultaneously: they give each item a unique address and they group related items together.

Most academic libraries in the United States use the Library of Congress Classification (LCC) system. Public libraries more commonly use the Dewey Decimal Classification (DDC) system. Both systems organize knowledge into subject categories, but they do so differently.

Because the LCC system groups related items together, browsing the shelves near a book you have already identified is a legitimate research strategy. If you find a useful book on environmental law at call number KF3775, looking at the books shelved nearby in the KF3700–3900 range will show you other books in environmental and natural resources law. This browsing strategy works in physical collections, and to some degree in digital catalogs as well: many catalog interfaces let you browse by call number, displaying the virtual shelf neighborhood around a particular item.

A library's digital collections extend its holdings far beyond physical shelves. Digital collections may include digitized books, manuscripts, photographs, maps, audio recordings, video, newspapers, archival documents, data sets, and other materials that have been converted to digital format and made available online.

A digital collection is a set of items that have been selected, digitized or born digital, described, and made accessible through a structured interface. Libraries, archives, museums, and government agencies all maintain digital collections. Some are freely accessible; others require library authentication.

Quality digital collections share several characteristics: documented provenance, rich metadata, preservation standards, clear access and rights information, and institutional accountability. This accountability distinguishes library digital collections from random content found on the open web.

Digital collections are especially valuable for primary source research. If you are researching American history, immigration, the Civil Rights Movement, or World War II, digital collections may give you access to original letters, photographs, newspapers, government documents, and oral history recordings that would otherwise require a visit to a physical archive. They are also valuable for interdisciplinary research, since aggregated collections may surface connections across fields that subject-specific databases would miss.

When you open a catalog record or find an item in a digital collection, you are looking at metadata — structured information that describes the item. Metadata is the scaffolding that makes large collections searchable and interpretable.

Not all catalog records are equally complete. A richly described record includes full bibliographic information, multiple subject headings, a summary, a table of contents, and links to related records. A minimal record may include only a title, an author, and a call number. When you encounter a minimal record, you can still evaluate the item by finding it physically, checking the title page and table of contents, or searching for the title or author in other databases to find fuller descriptions.

Finding a useful catalog record is only the beginning. If you do not record what you find, you may lose track of it when you are ready to write. Learning how to save, export, and organize catalog records is a practical research skill that saves significant time later.

Most online catalogs allow you to create a personal account where you can save records to lists or folders. If your catalog does not offer personal accounts, take full screenshots of catalog records — capturing title, author, date, publisher, call number, subject headings, and summary.

Reference managers like Zotero, Mendeley, and EndNote let you build a personal library of sources with full bibliographic information, notes, tags, and attached files, and can generate formatted citations and bibliographies in multiple citation styles. Using a reference manager from the beginning of a project — not as an afterthought — gives you an organized record of every source you have considered, not just the ones you ended up using. Chapter 24 of this textbook covers search result management and reference managers in detail.

Finding a catalog record is not the same as using a source. The record describes the item. The item itself contains the evidence. Understanding how to move from record to source is the last step of this chapter — and the first step of serious research.

When you get a physical item from the shelf, do not immediately begin reading from page one. Instead, orient yourself by reading the title page and verso to confirm publication details, reading the table of contents to see the book's structure, reading the introduction or preface to understand the argument and sources, checking the index for your specific topic, and checking the bibliography for additional sources.

For items available digitally through the library, the catalog record will include a link. Click the link, authenticate if required, and use the same orientation strategy: title page, table of contents, introduction, index, bibliography. Be aware that some digital books have restrictions on viewing, downloading, printing, or simultaneous access.

Access the MGU Library catalog or a publicly available library catalog such as the University of California system catalog (catalog.lib.berkeley.edu) or the New York Public Library catalog (catalog.nypl.org). Search for a topic related to your current research interest or choose one from the list below: urban food deserts, climate migration, digital privacy law, prison education programs, or water rights in the American West. Find one relevant book and open its full catalog record.

Visit one of the following digital collections: Library of Congress Digital Collections (loc.gov/collections), Digital Public Library of America (dp.la), or Internet Archive (archive.org). Choose a topic connected to your research or personal interest. Search for primary source materials — photographs, letters, historical documents, audio recordings, or maps — related to that topic. Find three items.

The following is a sample catalog record. Read it carefully and answer the evaluation questions that follow.

Use the following model when recording catalog research in your research notebook.

Notes: The subject heading "Urban agriculture" was more productive than the keyword "urban food systems." Most items are from 2008–2015. Need to look for more recent sources in databases to complement catalog findings. Check citation chaining from these books' bibliographies.

Next session tasks: Retrieve The Urban Food Revolution and Closing the Food Gap from shelves; request Food and the City via hold; check bibliographies for additional sources; search "Community gardens — United States" in the catalog.

Do not confuse findability with credibility. A book that appears in a library catalog must still be evaluated using the MGU Source Evaluation Model:

A catalog record is a starting point, not an endpoint. The work of evaluation is yours.

When you find a book through a library catalog that you intend to use in your research, record the full citation information immediately. Do not wait until you are writing your paper. The catalog record contains all the information you need to create a citation, but catalog records are not permanent — they may be updated, items may be moved, and digital catalog sessions expire.