Institution
Bavarian State Library
28
Universitätsbibliothek der Humboldt-Universität zu Berlin
18
University Library of Regensburg
14
Basel University Library
10
Bern University Library
5
University Library of Greifswald
4
Zentralbibliothek Zürich
4
Library Am Guisanplatz
2
Martin-Opitz Bibliothek Herne
2
The Swiss National Library
1