Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
416
LeibnizOpen (The Leibniz Association)
133
DataCite
91
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
70
WikiBooks - Open-content textbooks
63
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
56
Hathi Trust Digital Library
47
SSOAR - Social Science Open Access Repository
44
Wiley Online Library
44
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
42
Unknown
42
e-periodica (Swiss journals online, ETH Zurich)
32
David Rumsey Historical Map Collection (Cartography Associates)
25
Springer Nature (via Crossref)
22
Aarhus University: OJS at The State and University Library
21
Tidsskrift.dk (The Royal Library, Denmark)
21
Zenodo
14
e-rara.ch (ETH Zürich)
14
Biodiversity Heritage Library (BHL)
13
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
12
Frankfurt/Main University Library: Digitale Sammlungen
10
The digital State Library of Upper Austria (oö)
10
De Gruyter (via Crossref)
9
Digital Repository of Scientific Institutes (RCIN)
9
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
9
UQAM - Université du Québec à Montréal: archipel
9
University of Vienna: Phaidra
9
TU Braunschweig: LeoPARD - Publications And Research Data
8
University of Michigan: Digital Collections
8
Informa (via Crossref)
7
Vienna University Library: Digitale Sammlungen
7
dilibri (Landesbibliothekszentrum Rhineland-Palatinate)
7
EconStor (German National Library of Economics, ZBW)
6
Georg-August-Universität Göttingen: GOEDOC
6
Harvard University: Harvard Collections
6
Staatsbibliothek zu Berlin: Digitised Collections
6
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
6
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
5
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
4
Digitale Bibliothek Mecklenburg-Vorpommern (Greifswald University)
4
Directory of Open Access Journals: DOAJ Articles
4
GEO-LEOe-docs (FID GEO)
4
JECES - Journal of East Central European Studies (Herder-Institut)
4
NTNU Open Archive (Norwegian University of Science and Technology)
4
Publication Server of Goethe University Frankfurt am Main
4
Swedish National Data Service (SND)
4
Swiss Medical Publishers EMH
4
e-manuscripta.ch
4
Aalborg University's Research Portal
3
Aarhus University: Research
3
more ...