Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
231,906
PANGAEA - Data Publisher for Earth & Environmental Science
123,528
DataCite Metadata Store (German National Library of Science and Technology)
110,994
Directory of Open Access Journals: DOAJ Articles
101,803
Unknown
57,224
ScienceDirect (Elsevier - via Crossref)
36,001
Springer Nature (via Crossref)
27,011
Wiley Online Library (via Crossref)
26,807
PubMed Central (PMC)
24,374
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23,295
Cambridge University Press
22,405
Wiley Online Library
15,043
Université de Nantes: HAL-UNIV-NANTES
14,788
Informa (via Crossref)
14,779
Copernicus Publications: E-Journals
12,744
Open Parks Network
12,595
Institut national des sciences de l'Univers: HAL-INSU
12,202
LeibnizOpen (The Leibniz Association)
12,127
ScienceDirect (Elsevier)
11,771
Defense Technical Information Center: DTIC Technical Reports database
11,329
Niedersächsisches Online-Archiv NOA
9,405
MDPI Open Access Publishing
8,594
Canadian Science Publishing (via Crossref)
8,091
HighWire Press (Stanford University)
7,632
National Institute of Polar Research Repository, Japan
7,549
University of Copenhagen: Research
7,228
Aarhus University: Research
6,747
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6,404
University of Tromsø: Munin Open Research Archive
6,317
eCite UTAS (University of Tasmania)
6,002
Oxford University Press (via Crossref)
5,881
Natural Environment Research Council: NERC Open Research Archive
5,741
HAL Sorbonne Université
5,182
University of Calgary Journal Hosting
5,118
Hathi Trust Digital Library
5,075
Digital.CSIC (Spanish National Research Council)
4,975
Technical University of Denmark: DTU Orbit
4,165
Memorial University of Newfoundland: Research Repository
4,159
Zenodo
4,151
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4,139
Biodiversity Heritage Library (BHL)
3,974
Ohio State University (OSU): Knowledge Bank
3,673
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3,424
WikiBooks - Open-content textbooks
3,415
SAGE Publications (via Crossref)
3,331
Institute for Marine Research: Brage IMR
3,309
Oxford University Press
3,168
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3,148
University of Lethbridge Digitized Collections
3,145
Skemman (Iceland)
3,066
more ...