Content Provider
NASA Technical Reports Server (NTRS)
80
Arctic Council Repository
77
Unknown
22
Copernicus Publications: E-Journals
20
Lund University Publications Student Papers (LUP-SP)
19
The Winnower
18
The University of Melbourne: Digitised Collections
14
University of Washington, Seattle: Digital Collections
11
IOP Publishing
9
Université Laval: CorpusUL
9
Zenodo
9
Ohio State University (OSU): Knowledge Bank
8
PeerJ Publishing
8
University of Alberta: Era - Education and Research Archive
8
DataCite Metadata Store (German National Library of Science and Technology)
6
OSKAR Bordeaux (Open Science Knowledge ARchive)
6
University of California: eScholarship
6
Wiley Online Library
6
University of Copenhagen: Research
5
BioMed Central
4
COS Center for Open Science (via Crossref)
3
Carleton University's Institutional Repository
3
Jagiellonian University Repository
3
Max Planck Society: MPG.PuRe
3
Open archive Nord universitet
3
Pensoft Publishers
3
Texas State University: Digital Collections Repository
3
eScholarship Repository (University of California)
3
Aarhus University: Research
2
DataSpace at Princeton University
2
Digital.CSIC (Spanish National Research Council)
2
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
2
Emerald
2
Expeditio - Repositorio Institucional Universidad de Bogotá Jorge Tadeo Lozano (UTADEO)
2
Ike Skelton Combined Arms Research Library (CARL) Digital Library
2
Queen's University, Ontario: QSpace
2
Roskilde University Research Portal (RUC)
2
UNEP Document Repository (UN Environment Programme)
2
Universitat Politècnica de Catalunya (UPC): Theses and Dissertations Online (TDX)
2
University of Florida: Digital Library Center
2
University of Toronto: Research Repository T-Space
2
University of Washington, Seattle: ResearchWorks
2
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
2
ACS Publications (via Crossref)
1
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
American Museum of Natural History: AMNH scientific publications
1
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Brigham Young University (BYU): Digital Collections
1
Charles University CU Digital repository
1
Cornell University: eCommons@Cornell
1
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