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- Alexander Street Press, issuing body41
- ProQuest (Firm)34
- EBSCO Publishing (Firm)33
- Gale (Firm), publisher28
- Chadwyck-Healey, Inc24
- ProQuest Information and Learning Company23
- Gale (Firm), issuing body22
- ProQuest (Firm), publisher21
- Adam Matthew Digital (Firm)20
- Alexander Street Press20
- ProQuest (Firm), issuing body17
- Adam Matthew Digital (Firm), issuing body15
- Readex (Firm)15
- University of Chicago11
- East View Information Services10
- East View Information Services, publisher10
- Gale (Firm)10
- Thomson Gale (Firm)10
- Adam Matthew Digital (Firm), publisher9
- Brill Academic Publishers, publisher9