Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
231,906
PANGAEA - Data Publisher for Earth & Environmental Science
125,201
DataCite Metadata Store (German National Library of Science and Technology)
121,211
Directory of Open Access Journals: DOAJ Articles
101,803
Unknown
57,059
ScienceDirect (Elsevier - via Crossref)
28,642
Springer Nature (via Crossref)
27,011
PubMed Central (PMC)
24,502
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23,295
Cambridge University Press
22,729
Wiley Online Library
21,708
Wiley Online Library (via Crossref)
21,235
ScienceDirect (Elsevier)
19,684
Université de Nantes: HAL-UNIV-NANTES
14,802
Informa (via Crossref)
12,962
Copernicus Publications: E-Journals
12,744
Open Parks Network
12,595
Institut national des sciences de l'Univers: HAL-INSU
12,339
LeibnizOpen (The Leibniz Association)
12,127
Defense Technical Information Center: DTIC Technical Reports database
11,329
Niedersächsisches Online-Archiv NOA
9,688
MDPI Open Access Publishing
8,594
HighWire Press (Stanford University)
7,633
National Institute of Polar Research Repository, Japan
7,550
University of Copenhagen: Research
7,364
Canadian Science Publishing (via Crossref)
6,899
Aarhus University: Research
6,839
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6,430
University of Tromsø: Munin Open Research Archive
6,366
eCite UTAS (University of Tasmania)
6,002
Natural Environment Research Council: NERC Open Research Archive
5,774
HAL Sorbonne Université
5,293
University of Calgary Journal Hosting
5,120
Hathi Trust Digital Library
5,075
Digital.CSIC (Spanish National Research Council)
5,034
Informa
4,985
Oxford University Press (via Crossref)
4,763
Oxford University Press
4,452
Technical University of Denmark: DTU Orbit
4,198
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4,178
Memorial University of Newfoundland: Research Repository
4,167
Zenodo
4,151
Biodiversity Heritage Library (BHL)
3,978
Canadian Science Publishing
3,771
Ohio State University (OSU): Knowledge Bank
3,676
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3,518
WikiBooks - Open-content textbooks
3,415
Institute for Marine Research: Brage IMR
3,316
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3,200
University of Lethbridge Digitized Collections
3,145
more ...