Content Provider
Arctic Data Center (via DataONE)
7
Arctic Institute of North America
1
DataCite Metadata Store (German National Library of Science and Technology)
5
Defense Technical Information Center: DTIC Technical Reports database
1
Dryad Digital Repository (Duke University)
300
NASA Technical Reports Server (NTRS)
1
Oxford University Press (via Crossref)
1
Springer Nature (via Crossref)
1
University of Alaska: ScholarWorks@UA
1
University of Bayreuth: ERef Bayreuth
1
University of Calgary Journal Hosting
3
University of New Hampshire: Scholars Repository
1
Unknown
2
Wiley Online Library
1
Wiley Online Library (via Crossref)
2
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
3