Content Provider
The Gateway to Oklahoma History (University of North Texas Libraries)
18
Directory of Open Access Journals: DOAJ Articles
4
University of Tromsø: Septentrio Academic Publishing
3
University of North Texas: UNT Digital Library
2
Unknown
2
NILU – Norwegian Institute for Air Research: NILU Brage
1
The Portal to Texas History (University of North Texas)
1
University of Alberta: Era - Education and Research Archive
1
Zenodo
1