Content Provider
Directory of Open Access Journals: DOAJ Articles
53
DataCite Metadata Store (German National Library of Science and Technology)
50
University of California: eScholarship
18
University of Alaska: ScholarWorks@UA
12
Defense Technical Information Center: DTIC Technical Reports database
11
Arctic Data Center (via DataONE)
6
Cambridge University Press
6
ScienceDirect (Elsevier - via Crossref)
5
Springer Nature (via Crossref)
5
Columbia University: Academic Commons
4
University of North Texas: UNT Digital Library
4
Canadian Science Publishing (via Crossref)
3
University of Calgary Journal Hosting
3
University of Idaho Library: Digital Initiatives
3
Wiley Online Library
3
Biodiversity Heritage Library (BHL)
2
Lund University Publications (LUP)
2
Umeå University: Publications (DiVA)
2
Unknown
2
DIAL@UCLouvain (Université catholique de Louvain)
1
DIAL@USL-B (Université Saint-Louis, Bruxelles)
1
De Gruyter (via Crossref)
1
Frontiers (Publisher)
1
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences)
1
Indigo - University of Illinois at Chicago
1
Institute of Botany: IBCAS OpenIR (Chinese Academy Of Sciences)
1
JSTOR (via Crossref)
1
LaCRIS - University of Lapland Current Research System
1
Nature Precedings
1
Northwest Institute of Plateau Biology: NWIPB OpenIR (Chinese Academy of Sciences)
1
OhioLINK: Electronic Theses and Dissertations Center
1
Oxford University Press (via Crossref)
1
PQDT Open: Open Access Dissertations and Theses (ProQuest)
1
Queen's University Belfast Research Portal
1
ScienceDirect (Elsevier)
1
University of Alabama Institutional Repository
1
University of Alabama Libraries: Acumen
1
University of California Press
1
University of New Hampshire: Scholars Repository
1
University of Texas at El Paso: Digital Commons@UTEP
1
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
1
Università Politecnica delle Marche: IRIS
1
Wiley Online Library (via Crossref)
1
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
1