Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
85
PANGAEA - Data Publisher for Earth & Environmental Science
65
Defense Technical Information Center: DTIC Technical Reports database
19
Directory of Open Access Journals: DOAJ Articles
2
Dryad Digital Repository (Duke University)
2
Polar Research (E-Journal)
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
University of North Texas: UNT Digital Library
1
Unknown
1