Content Provider
University of Alaska: ScholarWorks@UA
1,352
Open Parks Network
1,033
Washington State University: WSU Libraries Digital Collections
612
DataCite Metadata Store (German National Library of Science and Technology)
472
Defense Technical Information Center: DTIC Technical Reports database
197
Arctic Council Repository
139
Unknown
100
Cambridge University Press
99
University of Lethbridge Digitized Collections
82
PANGAEA - Data Publisher for Earth & Environmental Science
59
Directory of Open Access Journals: DOAJ Articles
45
University of Calgary Journal Hosting
41
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
38
Université de Nantes: HAL-UNIV-NANTES
29
Institut national des sciences de l'Univers: HAL-INSU
23
University of North Texas: UNT Digital Library
23
Copernicus Publications: E-Journals
18
Hathi Trust Digital Library
18
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
17
Wiley Online Library (via Crossref)
17
Canadian Science Publishing (via Crossref)
16
HAL Sorbonne Université
16
Université Grenoble Alpes: HAL
16
Niedersächsisches Online-Archiv NOA
15
Oklahoma State University: Digital Collections @ OKSTATE Library
15
PubMed Central (PMC)
15
Érudit.org (Université Montréal)
15
Aix-Marseille Université: HAL
12
Archives ouvertes de Paris-Saclay
12
Informa (via Crossref)
12
Météo-France: HAL
11
Université Toulouse III - Paul Sabatier: HAL-UPS
11
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
11
North Dakota State University (NDSU): Digital Horizons
10
University of Tromsø: Septentrio Academic Publishing
10
Wiley Online Library
10
Ohio State University (OSU): Knowledge Bank
8
University of Alberta: Era - Education and Research Archive
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
Hunter Library Digital Collections (Western Carolina University)
5
Mountain Scholar (Digital Collections of Colorado and Wyoming)
5
SAGE Publications (via Crossref)
5
ScienceDirect (Elsevier - via Crossref)
5
University of Washington, Seattle: ResearchWorks
5
more ...