Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
231,906
PANGAEA - Data Publisher for Earth & Environmental Science
124,634
DataCite Metadata Store (German National Library of Science and Technology)
121,211
Directory of Open Access Journals: DOAJ Articles
101,803
Unknown
57,200
ScienceDirect (Elsevier - via Crossref)
36,001
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
22,640
Wiley Online Library (via Crossref)
22,146
Wiley Online Library
20,559
Université de Nantes: HAL-UNIV-NANTES
14,793
Informa (via Crossref)
13,316
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
ScienceDirect (Elsevier)
11,771
Defense Technical Information Center: DTIC Technical Reports database
11,329
Niedersächsisches Online-Archiv NOA
9,623
MDPI Open Access Publishing
8,594
HighWire Press (Stanford University)
7,633
National Institute of Polar Research Repository, Japan
7,549
University of Copenhagen: Research
7,330
Canadian Science Publishing (via Crossref)
7,159
Aarhus University: Research
6,807
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6,422
University of Tromsø: Munin Open Research Archive
6,362
eCite UTAS (University of Tasmania)
6,002
Natural Environment Research Council: NERC Open Research Archive
5,764
HAL Sorbonne Université
5,271
University of Calgary Journal Hosting
5,119
Hathi Trust Digital Library
5,075
Oxford University Press (via Crossref)
5,021
Digital.CSIC (Spanish National Research Council)
5,008
Informa
4,432
Technical University of Denmark: DTU Orbit
4,191
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4,169
Memorial University of Newfoundland: Research Repository
4,167
Zenodo
4,151
Oxford University Press
4,103
Biodiversity Heritage Library (BHL)
3,978
Ohio State University (OSU): Knowledge Bank
3,674
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3,509
Canadian Science Publishing
3,504
WikiBooks - Open-content textbooks
3,415
Institute for Marine Research: Brage IMR
3,315
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3,194
University of Lethbridge Digitized Collections
3,145
more ...