Content Provider
WikiBooks - Open-content textbooks
128
Biodiversity Heritage Library (BHL)
44
Cambridge University Press
33
Unknown
18
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
13
e-rara.ch (ETH Zürich)
5
DataCite Metadata Store (German National Library of Science and Technology)
3
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis)
2
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository)
2
Ohio State University (OSU): Knowledge Bank
2
Share it - Open Access und Forschungsdaten-Repositorium der Hochschulbibliotheken in Sachsen-Anhalt
2
Technical University of Denmark: DTU Orbit
2
Texas A&M University Digital Repository
2
UQAM - Université du Québec à Montréal: archipel
2
University of Kent: KAR - Kent Academic Repository
2
VTT's Research Information Portal
2
Aalborg University's Research Portal
1
Aisberg - Archivio istituzionale dell'Università di Bergamo
1
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Arctic Portal Library
1
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
1
David Rumsey Historical Map Collection (Cartography Associates)
1
Doria (National Library of Finland)
1
European University Institute, Italy: Cadmus (EUI Research Repository)
1
Falmouth University Research Repository (FURR)
1
Lund University Publications (LUP)
1
Monash Collections Online
1
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1
Open Research Library
1
Oxford University Press
1
Oxford University Press (via Crossref)
1
PRISM - University of Calgary Digital Repository
1
Spring Arbor University: White Library Digital Repository
1
The Catholic University of America: Digital Collections
1
UNESDOC - UNESCO Digital Library
1
Universidade Federal da Bahia: Repositório Institucional da UFBA
1
University of Malta: OAR@UM
1
University of Wollongong, Australia: Research Online
1
Université Paris 1 Panthéon-Sorbonne: HAL
1
Université Paris-Panthéon-Assas: HAL
1
Université de Nantes: HAL-UNIV-NANTES
1