Eight Centuries: 1160-1965
The primary source portal to 100M+ links to content in all historical disciplines. Eight Centuries covers Humanities; Physical Sciences; Art History; Legal History; Engineering; Psychology; Cartography and the History of Medicine.
“Eight Centuries is the most comprehensive research tool for 19th century studies. It should be the researcher's first stop to explore the literature .“ ***** (5 Stars) — The Charleston Advisor
Reference Universe
The Comprehensive Guide to Specialized Encyclopedias
Reference Universe integrates 30M + links to specialized subject encyclopedias, compendia, and scholarly handbooks, offering a comprehensive view of authoritative introductory articles in your own library reference collection and beyond.
“Two databases for identifying initial overview articles deserve particular emphasis, Reference Universe and Web of Science. The easiest way is through Reference Universe....it provides much more extensive coverage than any other single source.” — Oxford Guide to Library Research, 4th ed.
United States Masterfile: 1774-2025
A single search across 15M+ historical and contemporary public and political documents, from the Continental Congress to today.
“U.S. Masterfile is designed by people who know historical finding tools and how to bring them together in a seamless interface. “ — Documents Librarian, Johns Hopkins University