Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
127
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
58
WikiBooks - Open-content textbooks
53
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
42
Hathi Trust Digital Library
25
e-rara.ch (ETH Zürich)
14
Springer Nature (via Crossref)
11
Biodiversity Heritage Library (BHL)
10
Unknown
10
Digital Repository of Scientific Institutes (RCIN)
9
University of Vienna: Phaidra
9
TU Braunschweig: LeoPARD - Publications And Research Data
8
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
8
University of Michigan: Digital Collections
8
Frankfurt/Main University Library: Digitale Sammlungen
7
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6
EconStor (German National Library of Economics, ZBW)
5
Harvard University: Harvard Collections
5
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
5
Georg-August-Universität Göttingen: GOEDOC
4
Staatsbibliothek zu Berlin: Digitised Collections
4
Wiley Online Library
4
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
3
Share it - Open Access und Forschungsdaten-Repositorium der Hochschulbibliotheken in Sachsen-Anhalt
3
University of Münster: Digital Collections
3
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
3
dilibri (Landesbibliothekszentrum Rhineland-Palatinate)
3
epub.oeaw (The digital publication portal of the Austrian Academy of Sciences)
3
Brigham Young University (BYU): ScholarsArchive
2
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
DergiPark Akademik (E-Journals)
2
Directory of Open Access Books (DOAB)
2
Directory of Open Access Journals: DOAJ Articles
2
Informa (via Crossref)
2
JECES - Journal of East Central European Studies (Herder-Institut)
2
KITopen (Karlsruhe Institute of Technologie)
2
Kujawsko-Pomorska Digital Library (Nicolaus Copernicus University Torun) / Kujawsko-Pomorska Biblioteka Cyfrowa
2
Swiss Medical Publishers EMH (via Crossref)
2
Thieme (via Crossref)
2
University of Potsdam: publish.UP
2
University of St. Gallen: Research Platform Alexandria
2
York University Digital Library
2
da|ra - Registration agency for social and economic data
2
ART-Dok (Virtual Library for Art, Heidelberg University)
1
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
BORIS (Bern Open Repository and Information System, University of Bern)
1
Berlin-Brandenburgischen Akademie der Wissenschaften (BBAW): Publications
1
Digital Library Thüringen
1
Digital Library of University of Wroclaw
1
ETH Zürich Research Collection
1
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