Content Provider
Biodiversity Heritage Library (BHL)
76
WikiBooks - Open-content textbooks
51
Cambridge University Press
7
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
6
DataCite Metadata Store (German National Library of Science and Technology)
4
De Gruyter
3
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
2
Galiciana: Biblioteca Dixital de Galicia (Digital Library of Galicia)
2
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
2
JSTOR
2
Max Planck Society: MPG.PuRe
2
UQAM - Université du Québec à Montréal: archipel
2
Unknown
2
Arca (BC's Digital Treasures)
1
Biblioteca Virtual del Patrimonio Bibliográfico
1
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
1
David Rumsey Historical Map Collection (Cartography Associates)
1
Informa (via Crossref)
1
Johns Hopkins University Press
1
Mid Sweden University: Publications (DiVA)
1
Oxford University Press (via Crossref)
1
PRISM - University of Calgary Digital Repository
1
The Catholic University of America: Digital Collections
1
UNBC's Digital Institutional Repository (University of Northern British Columbia)
1
USRA Houston Repository (Universities Space Research Association)
1
University of Georgia: Athenaeum@UGA
1
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
1
University of Minnesota Press (via Crossref)
1
University of the Highlands and Islands: Research Database of UHI
1
Uppsala University: Publications (DiVA)
1
Utrecht University Repository
1
VIURRSpace (Royal Roads University and Vancouver Island University)
1
e-rara.ch (ETH Zürich)
1