Below are a few subject searches. There are many others. The subjects are created by the Library of Congress:
Library of Congress Classification (call numbers) are useful to know for your area of concentration - it helps you locating books in the library stacks. Check the links below for detailed information about call number ranges. Each file shows the overview first; subsequent pages shows very detailed breakdown of the topic.
Contains books and scholarly journals digitized from libraries around the world covering many topics and languages. Choose University of New Mexico for full access to restricted content and log in with NetID
Information about North America, Central America, South America, the Arctic, Antarctica, and the West Indies, published across the globe.This collection of many hard-to-find primary sources covers society, politics, culture, religious beliefs, and contemporary opinions, at home and abroad.
As well, included are original accounts of exploration, pioneering, settlement, the Western movement, military actions, Native Americans, slavery, and abolition. Coverage: 1500 to 1926.