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Library of Congress Subject Headings are assigned to every title (with a few exceptions) in our catalog, usually more than one subject heading is assigned to each title. Only one determines its call number, but all are helpful tools for navigating the catalog and confirming what the most effective keywords for your topic are. Searching using words from the Subject Heading's controlled vocabulary is a great practice to get in the habit of doing.
Speak the catalog's language - use Subject Heading vocabulary in your keyword searches.
Click on Subject Heading links at the bottom of a catalog record to
browse the collection for more materials in that subject.
Try these Subject searches:
any country name
Region names such as Africa SubSaharan, Africa East, Africa North etc.
Always consult the footnotes and bibliographies in secondary sources you read or in reference books you use for background information. Citations there are you best leads to findng sources for your paper. Starting with other scholars citations is engaging in the scholarly conversation and an important practice.