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- Alexander Street Press, issuing body41
- ProQuest (Firm)34
- EBSCO Publishing (Firm)33
- Adam Matthew Digital (Firm)31
- Gale (Firm), publisher31
- Chadwyck-Healey, Inc24
- ProQuest (Firm), publisher23
- ProQuest Information and Learning Company23
- Gale (Firm), issuing body22
- Adam Matthew Digital (Firm), issuing body21
- Alexander Street Press20
- ProQuest (Firm), issuing body17
- Readex (Firm)15
- Brill Academic Publishers, publisher13
- University of Virginia. Press13
- National Archives (Great Britain)12
- Adam Matthew Digital (Firm), publisher11
- University of Chicago11
- East View Information Services10
- East View Information Services, publisher10