Content Provider
Arctic Data Center (via DataONE)
27
DataCite Metadata Store (German National Library of Science and Technology)
9
University of Michigan: Digital Collections
5
Aarhus University: Research
3
Biodiversity Heritage Library (BHL)
2
Unknown
2
Aarhus University: OJS at The State and University Library
1
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Copernicus Publications: E-Journals
1
Defense Technical Information Center: DTIC Technical Reports database
1
Directory of Open Access Journals: DOAJ Articles
1
Lancaster University: Lancaster Eprints
1
Niedersächsisches Online-Archiv NOA
1
Technical University of Denmark: DTU Orbit
1
Tidsskrift.dk (The Royal Library, Denmark)
1
University of Copenhagen: Research
1