Content Provider
DergiPark Akademik (E-Journals)
36
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
34
DataCite Metadata Store (German National Library of Science and Technology)
26
Croatian Digital Theses Repository (National and University Library in Zagreb)
12
Defense Technical Information Center: DTIC Technical Reports database
12
Stellenbosch University: SUNScholar Research Repository
11
WikiBooks - Open-content textbooks
10
Springer Nature (via Crossref)
9
Yıldız Technical University Research Information System
9
Ege University Institutional Repository
6
University of Tartu: Dspace
6
İstanbul Üniversitesi Açık Erişim Sistemi
6
Hrčak - Portal of scientific journals of Croatia
5
OpenKnowledge Ecology Repository
5
RWTH Aachen University: RWTH Publications
5
David Rumsey Historical Map Collection (Cartography Associates)
4
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
4
Dresden University of Technology: Qucosa
3
E-resource repository of the University of Latvia
3
ITU Academic Open Archive
3
NOAA NCEI Environmental Data Archive (via DataONE)
3
NaRDuS (National Repository of Dissertations in Serbia)
3
Afyon Kocatepe University Institutional Repository (DSpace@AKU)
2
Directory of Open Access Journals: DOAJ Articles
2
Erciyes University Research Information System
2
Hacettepe University Institutional Repository
2
Indonesia University of Education: repository@UPI
2
Pamukkale University Repository
2
Repository of the University of Ljubljana (RUL)
2
Texas Tech University: TTU DSpace Repository
2
The University of Split Repository
2
Udako Euskal Unibertsitatea: Inguma
2
University of Debrecen Electronic Archive (DEA)
2
AJOL - African Journals Online
1
Aarhus University: OJS at The State and University Library
1
Akdeniz Üniversitesi DSpace
1
Akroterion (E-Journal)
1
Ankara University Open Archive System
1
Arca (BC's Digital Treasures)
1
BORIS (Bern Open Repository and Information System, University of Bern)
1
Bartin University: DSpace@Bartin
1
Dicle University Institutional Repository (DSpace@Dicle)
1
Digital Library of University of Maribor
1
Estonian University of Life Sciences: DSpace
1
Gazi University Research Information System
1
Gümüşhane University Institutional Repository (DSpace@Gümüşhane)
1
Informa (via Crossref)
1
Istanbul Ticaret University Institutional Repository (DSpace@Ticaret)
1
Kocaeli University Research Information System
1
MACAU: Open Access Repository of Kiel University
1
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