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- United States325,776
- Adam Matthew Digital (Firm), digitiser189,764
- SpringerLink (Online service)166,413
- ebrary, Inc107,747
- United States. Congress. House71,614
- Library of Congress. Congressional Research Service61,181
- Project Muse59,762
- Geological Survey (U.S.)42,197
- United States. Congress. Senate34,642
- AM (Publisher), digitiser30,966
- ProQuest (Firm)26,522
- Gilder Lehrman Institute of American History, owner25,909
- United States. National Aeronautics and Space Administration25,582
- United States. Congress. Senate. Committee on Pensions. (1816-1946)25,090
- United States. Congress. House. Committee on Invalid Pensions. (1831-1946)24,986
- Infobase, film distributor23,474
- Safari Books Online (Firm)21,560
- Project Muse. distributor21,187
- United States. General Accounting Office20,914
- Yale University, degree granting institution19,751