Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
8,546
Defense Technical Information Center: DTIC Technical Reports database
3,552
Directory of Open Access Journals: DOAJ Articles
3,260
Unknown
2,691
PANGAEA - Data Publisher for Earth & Environmental Science
2,593
Arctic Data Center (via DataONE)
2,246
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
2,010
ScienceDirect (Elsevier - via Crossref)
1,105
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1,021
Copernicus Publications: E-Journals
983
Springer Nature (via Crossref)
931
Wiley Online Library
877
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
834
MDPI Open Access Publishing
744
RePEc (Research Papers in Economics)
730
Wiley Online Library (via Crossref)
714
Niedersächsisches Online-Archiv NOA
642
PubMed Central (PMC)
632
Université de Nantes: HAL-UNIV-NANTES
625
Zenodo
622
LeibnizOpen (The Leibniz Association)
492
Institut national des sciences de l'Univers: HAL-INSU
470
ScienceDirect (Elsevier)
466
CyberLeninka (Scientific Electronic Library)
436
University of California: eScholarship
401
Dryad Digital Repository (Duke University)
388
Université Savoie Mont Blanc: HAL
378
Université Grenoble Alpes: HAL
376
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
350
National Research Council Canada: NRC Publications Archive
314
IOP Publishing (via Crossref)
300
Canadian Science Publishing (via Crossref)
288
Informa (via Crossref)
288
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
278
University of Alaska: ScholarWorks@UA
277
Frontiers: Figshare
261
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences)
249
University of Copenhagen: Research
246
Cambridge University Press
236
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
231
Frontiers (Publisher)
207
Vrije Universiteit Amsterdam (VU): Research Portal
197
Max Planck Society: MPG.PuRe
187
Lund University Publications (LUP)
181
Aarhus University: Research
179
ESS-DIVE: Deep Insight for Earth Science Data (via DataONE)
178
NASA Technical Reports Server (NTRS)
175
University of Calgary Journal Hosting
161
IOP Publishing
158
University of Potsdam: publish.UP
147
more ...