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Author/Creator
- Library of Congress93
- National Library of Medicine (U.S.)51
- American Library Association50
- Library of Congress. Copyright Office49
- Library Association40
- R.L. Polk & Co24
- Library of Congress. Cataloging Distribution Service21
- United States. Office of Education19
- Association of College and Research Libraries17
- Institute of Museum and Library Services (U.S.)17
- New York State Library17
- Center for Research Libraries (U.S.)16
- Library of Congress. National Library Service for the Blind and Physically Handicapped16
- New York Public Library16
- Boston Public Library15
- Illinois State Library15
- John Winston Graham Aeronautical Collection (Beinecke Rare Book and Manuscript Library)15
- American Association of Law Libraries14
- Association of Research Libraries14
- California State Library13