Content Provider
Defense Technical Information Center: DTIC Technical Reports database
21
DataCite Metadata Store (German National Library of Science and Technology)
14
Unknown
6
Ohio State University (OSU): Knowledge Bank
4
Directory of Open Access Journals: DOAJ Articles
3
Natural Environment Research Council: NERC Open Research Archive
3
MDPI Open Access Publishing
2
Oxford University Press (via Crossref)
2
University of California: eScholarship
2
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
1
Arctic and Antarctic Research (E-Journal)
1
CESSDA DC Data Catalogue (Consortium of European Social Science Data Archives)
1
Columbia University: Academic Commons
1
CyberLeninka (Scientific Electronic Library)
1
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
1
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
1
IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria)
1
Informa (via Crossref)
1
LaCRIS - University of Lapland Current Research System
1
Lund University Publications (LUP)
1
NASA Technical Reports Server (NTRS)
1
National Institute of Polar Research Repository, Japan
1
Padua Research Archive (IRIS - Università degli Studi di Padova)
1
Polar Research (E-Journal)
1
RePEc (Research Papers in Economics)
1
Research Data Australia (Australian National Data Service - ANDS)
1
Sapienza Università di Roma: CINECA IRIS
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
Swedish National Data Service (SND)
1
The Repository of the University of Silesia (RE-BUŚ)
1
The University of Waikato: Research Commons
1
Universidade de Lisboa: repositório.UL
1
University of Lincoln: Lincoln Repository
1
University of North Texas: UNT Digital Library
1
University of Washington, Seattle: ResearchWorks
1
Université de Liege: BICTEL/e-ULg - Serveur institutionnel des thèses de doctorat
1
Utrecht University Repository
1
Vrije Universiteit Amsterdam (VU): Research Portal
1
Wiley Online Library
1