Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
231,906
PANGAEA - Data Publisher for Earth & Environmental Science
124,486
DataCite Metadata Store (German National Library of Science and Technology)
121,211
Directory of Open Access Journals: DOAJ Articles
101,803
Unknown
57,206
ScienceDirect (Elsevier - via Crossref)
36,001
Springer Nature (via Crossref)
27,011
PubMed Central (PMC)
24,374
Wiley Online Library (via Crossref)
23,669
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23,295
Cambridge University Press
22,476
Wiley Online Library
18,757
Université de Nantes: HAL-UNIV-NANTES
14,789
Informa (via Crossref)
14,108
Copernicus Publications: E-Journals
12,744
Open Parks Network
12,595
Institut national des sciences de l'Univers: HAL-INSU
12,276
LeibnizOpen (The Leibniz Association)
12,127
ScienceDirect (Elsevier)
11,771
Defense Technical Information Center: DTIC Technical Reports database
11,329
Niedersächsisches Online-Archiv NOA
9,575
MDPI Open Access Publishing
8,594
Canadian Science Publishing (via Crossref)
7,716
HighWire Press (Stanford University)
7,632
National Institute of Polar Research Repository, Japan
7,549
University of Copenhagen: Research
7,317
Aarhus University: Research
6,784
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6,416
University of Tromsø: Munin Open Research Archive
6,337
eCite UTAS (University of Tasmania)
6,002
Natural Environment Research Council: NERC Open Research Archive
5,751
Oxford University Press (via Crossref)
5,494
HAL Sorbonne Université
5,221
University of Calgary Journal Hosting
5,118
Hathi Trust Digital Library
5,075
Digital.CSIC (Spanish National Research Council)
4,982
Technical University of Denmark: DTU Orbit
4,182
Memorial University of Newfoundland: Research Repository
4,166
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4,156
Zenodo
4,151
Biodiversity Heritage Library (BHL)
3,976
Ohio State University (OSU): Knowledge Bank
3,674
Oxford University Press
3,584
Informa
3,576
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3,503
WikiBooks - Open-content textbooks
3,415
Institute for Marine Research: Brage IMR
3,309
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3,190
University of Lethbridge Digitized Collections
3,145
SAGE Publications (via Crossref)
3,111
more ...