Content Provider
University of Alaska: ScholarWorks@UA
1,344
Open Parks Network
1,033
Washington State University: WSU Libraries Digital Collections
490
DataCite Metadata Store (German National Library of Science and Technology)
430
Defense Technical Information Center: DTIC Technical Reports database
192
Cambridge University Press
93
Unknown
92
Directory of Open Access Journals: DOAJ Articles
44
PANGAEA - Data Publisher for Earth & Environmental Science
41
University of Calgary Journal Hosting
39
Arctic Council Repository
35
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
33
Université de Nantes: HAL-UNIV-NANTES
24
Institut national des sciences de l'Univers: HAL-INSU
22
University of North Texas: UNT Digital Library
22
Hathi Trust Digital Library
18
Copernicus Publications: E-Journals
17
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
17
HAL Sorbonne Université
16
Canadian Science Publishing (via Crossref)
15
Université Grenoble Alpes: HAL
15
Niedersächsisches Online-Archiv NOA
14
PubMed Central (PMC)
14
Wiley Online Library (via Crossref)
14
Érudit.org (Université Montréal)
14
Aix-Marseille Université: HAL
12
Archives ouvertes de Paris-Saclay
11
Informa (via Crossref)
11
Météo-France: HAL
11
Université Toulouse III - Paul Sabatier: HAL-UPS
11
North Dakota State University (NDSU): Digital Horizons
10
University of Tromsø: Septentrio Academic Publishing
10
Wiley Online Library
9
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
9
Ohio State University (OSU): Knowledge Bank
8
University of Alberta: Era - Education and Research Archive
8
University of Lethbridge Digitized Collections
8
WikiBooks - Open-content textbooks
8
University of Chicago Press (via Crossref)
7
Université du Littoral Côte d'Opale portail
7
Cambridge University Press (via Crossref)
6
Université d'Orléans: HAL
6
Archive de l'Observatoire de Paris (HAL)
5
Digital Collections of Colorado (Colorado State University)
5
Mountain Scholar (Digital Collections of Colorado and Wyoming)
5
SAGE Publications (via Crossref)
5
University of Washington, Seattle: ResearchWorks
5
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
4
HighWire Press (Stanford University)
4
Hunter Library Digital Collections (Western Carolina University)
4
more ...