Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,200
David Rumsey Historical Map Collection (Cartography Associates)
618
Hathi Trust Digital Library
171
Biodiversity Heritage Library (BHL)
120
Temple University Digital Collections
115
University of Michigan: Digital Collections
56
The University of Utah: J. Willard Marriott Digital Library
42
DataCite
39
Defense Technical Information Center: DTIC Technical Reports database
35
North Dakota State University (NDSU): Digital Horizons
32
University of Washington, Seattle: Digital Collections
30
Penn Press - University of Pennsylvania Press
27
PANGAEA - Data Publisher for Earth & Environmental Science
25
Hirsla - Landspítali University Hospital research archive
24
Zenodo
23
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
22
University of Lethbridge Digitized Collections
22
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
20
Hunter Library Digital Collections (Western Carolina University)
20
University of the Pacific, McGeorge School of Law: Scholarly Commons
19
University of the Pacific: Scholarly Commons
19
Université de Nantes: HAL-UNIV-NANTES
17
Jefferson Digital Commons (Thomas Jefferson University, Philadelphia)
16
Unknown
16
Directory of Open Access Journals: DOAJ Articles
14
Gulf of Alaska Data Portal (via DataONE)
11
Texas Tech University: TTU DSpace Repository
11
Washington State University: WSU Libraries Digital Collections
11
University of Nebraska-Lincoln: DigitalCommons@UNL
10
BioOne Online Journals
9
Environmental Data Initiative (via DataONE)
9
The Library of Congress: American Memory
9
University of Michigan: Deep Blue
9
University of North Texas: UNT Digital Library
9
Cambridge University Press
8
HighWire Press (Stanford University)
8
The Seattle Public Library Special Collections Online
8
Wiley Online Library
8
APS Digital Library (American Philosophical Society)
7
ESS-DIVE: Deep Insight for Earth Science Data (via DataONE)
7
OhioLINK: Ohio Digital Resource Commons (DRC)
7
PALNI Digital Library Collections (Private Academic Library Network of Indiana)
7
Philadelphia College of Osteopathic Medicine: DigitalCommons@PCOM
7
The Online Books Page (Penn Libraries, University of Pennsylvania)
7
UTSA Digital Collections (The University of Texas at San Antonio)
7
Universidade Federal de São Paulo (UNIFESP): Repositório Institucional
7
Cambridge University Press (via Crossref)
6
Oxford University Press (via Crossref)
6
Universidad de Las Palmas de Gran Canaria: Acceda
6
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
6
more ...