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Internet Library of Early Journals : A Digital Library of 18th and 19th Century Journals (nicht mehr online)
Datenbank-Infosystem (DBIS)
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Wiley Online Library
Datenbank-Infosystem (DBIS)
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Directory of Open Access Books
Datenbank-Infosystem (DBIS)
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OSF Preprints
Datenbank-Infosystem (DBIS)