Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
231,906
PANGAEA - Data Publisher for Earth & Environmental Science
124,523
DataCite Metadata Store (German National Library of Science and Technology)
121,211
Directory of Open Access Journals: DOAJ Articles
101,803
Unknown
57,203
ScienceDirect (Elsevier - via Crossref)
36,001
Springer Nature (via Crossref)
27,011
PubMed Central (PMC)
24,374
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23,295
Cambridge University Press
22,561
Wiley Online Library (via Crossref)
22,178
Wiley Online Library
20,516
Université de Nantes: HAL-UNIV-NANTES
14,791
Informa (via Crossref)
13,692
Copernicus Publications: E-Journals
12,744
Open Parks Network
12,595
Institut national des sciences de l'Univers: HAL-INSU
12,338
LeibnizOpen (The Leibniz Association)
12,127
ScienceDirect (Elsevier)
11,771
Defense Technical Information Center: DTIC Technical Reports database
11,329
Niedersächsisches Online-Archiv NOA
9,597
MDPI Open Access Publishing
8,594
HighWire Press (Stanford University)
7,632
National Institute of Polar Research Repository, Japan
7,549
Canadian Science Publishing (via Crossref)
7,396
University of Copenhagen: Research
7,320
Aarhus University: Research
6,794
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6,419
University of Tromsø: Munin Open Research Archive
6,349
eCite UTAS (University of Tasmania)
6,002
Natural Environment Research Council: NERC Open Research Archive
5,754
HAL Sorbonne Université
5,245
Oxford University Press (via Crossref)
5,229
University of Calgary Journal Hosting
5,119
Hathi Trust Digital Library
5,075
Digital.CSIC (Spanish National Research Council)
4,996
Technical University of Denmark: DTU Orbit
4,186
Memorial University of Newfoundland: Research Repository
4,167
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4,164
Zenodo
4,151
Informa
4,017
Biodiversity Heritage Library (BHL)
3,978
Oxford University Press
3,861
Ohio State University (OSU): Knowledge Bank
3,674
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3,506
WikiBooks - Open-content textbooks
3,415
Institute for Marine Research: Brage IMR
3,313
Canadian Science Publishing
3,262
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3,192
University of Lethbridge Digitized Collections
3,145
more ...