Mail in order postcard for the Gustav Fock Bookstore. Karl Heinrich Gustav Fock (1854-1910) was a bookseller and publisher, specializing in books on physical, chemical and mathematical subjects.
Buchhandlung Gustav Fock. “Bücher-Zettel an Die Buchhandlung Gustav Fock,” circa 1900. Papers of Georg and Max Bredig, Box 3, Folder 5. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/9xyfz4u.
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