Institution
Bavarian State Library
21
Universitätsbibliothek der Humboldt-Universität zu Berlin
11
University Library of Regensburg
8
Zentralbibliothek Zürich
4
Library of the Academy of Sciences of the Czech Republic
3
National Library of Sweden - Kungliga biblioteket
1
Bern University Library
1
Research Library Olomouc
1