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Museums and Public Art Galleries:
 Daniel Hopfer at the Detroit Institute of Arts, Michigan
Fine Arts Museums of San Francisco
Many works by Daniel Hopfer
Hermitage Museum, Saint Petersburg, Russia
Voluptas
Museum of Fine Arts, Boston 
Royal Academy of Arts Collection, London, UK NEW!
Art Gallery of Greater Victoria, British Columbia NEW!
Art Gallery of the University of Rochester, New York
Martin Luther
Bowdoin College Museum of Art, Maine (Zoomable) NEW!
Portrait of Pope Leo X and Guiliano de' Medici, etching
Cleveland Museum of Art, Ohio
Harvard University Art Museums, Massachusetts NEW!
Museum fur Kunst und Gewerbe, Hamburg, Germany
Schleswig-Holstein Museums, Germany
9 works online
Spencer Museum of Art at the University of Kansas
Professional Tools:
Artprice
Artarchiv Sample Artist Symbols + Monograms
Scroll down to monogram 293
Pictures from Image Archives:
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
University of Michigan SILS Art Image Browser
Articles:
Union List of Artist Names (Getty Museum)
Reference sheet with basic information about the artist and pointers to other references.
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