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- Alexander Street Press, issuing body41
- Adam Matthew Digital (Firm)31
- ProQuest (Firm)29
- Gale (Firm), publisher26
- Chadwyck-Healey, Inc21
- Gale (Firm), issuing body21
- ProQuest (Firm), publisher21
- Alexander Street Press20
- Adam Matthew Digital (Firm), issuing body18
- EBSCO Publishing (Firm)17
- ProQuest (Firm), issuing body16
- ProQuest Information and Learning Company16
- Readex (Firm)14
- University of Virginia. Press13
- Brill Academic Publishers, publisher12
- National Archives (Great Britain)12
- Adam Matthew Digital (Firm), publisher11
- University of Chicago11
- Thomson Gale (Firm)9
- Brill Academic Publishers, issuing body8