Content Provider
Apollo - University of Cambridge Repository
50
DataCite Metadata Store (German National Library of Science and Technology)
30
Directory of Open Access Journals: DOAJ Articles
22
National Institute of Polar Research Repository, Japan
22
Technical University of Denmark: DTU Orbit
21
Unknown
12
Aarhus University: Research
11
University of Copenhagen: Research
11
Arctic Data Center (via DataONE)
8
Defense Technical Information Center: DTIC Technical Reports database
8
GFZ Data Services (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
8
University of Michigan: Digital Collections
8
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
7
Copernicus Publications: E-Journals
6
Niedersächsisches Online-Archiv NOA
5
ScienceDirect (Elsevier - via Crossref)
4
University of Leicester: Leicester Research Archive (LRA)
3
BioMed Central
2
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
2
PubMed Central (PMC)
2
Springer Nature (via Crossref)
2
UNESDOC - UNESCO Digital Library
2
University of Leicester: Figshare
2
University of Maryland: Digital Repository (DRUM)
2
University of Southern Denmark Research Portal
2
University of Tartu: ojs.utlib.ee
2
Érudit.org (Université Montréal)
2
Arctic and Antarctic Research (E-Journal)
1
Cambridge University Press
1
Cambridge University Press (via Crossref)
1
CentAUR: Central Archive at the University of Reading
1
Colecciones digitales - Biblioteca Virtual del Banco de la República
1
Durham University: Durham Research Online
1
ETH Zürich Research Collection
1
Frontiers (Publisher)
1
Harvard Dataverse
1
Harvard University: DASH - Digital Access to Scholarship at Harvard
1
Hes-so: ArODES Open Archive (University of Applied Sciences and Arts Western Switzerland)
1
HighWire Press (Stanford University)
1
Indiana University: Digital Library of the Commons (DLC)
1
Informa (via Crossref)
1
JSTOR (via Crossref)
1
MDPI Open Access Publishing
1
NASA Technical Reports Server (NTRS)
1
NIOZ Repository (Royal Netherlands Institute for Sea Research)
1
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1
OpenEdition
1
Polar Research (E-Journal)
1
Radboud University: DSpace
1
RePEc (Research Papers in Economics)
1
more ...