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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
Art Gallery of Greater Victoria, British Columbia
Bowdoin College Museum of Art, Maine (Zoomable)
Portrait of Pope Leo X and Guiliano de' Medici, etching
Cleveland Museum of Art, Ohio
Finnish National Gallery Art Collections, Helsinki, Finland NEW!
Harvard University Art Museums, Massachusetts
Memorial Art Gallery of the University of Rochester, New York
Martin Luther
Museum fur Kunst und Gewerbe, Hamburg, Germany
Schleswig-Holstein Museums, Germany
9 works online
Spencer Museum of Art at the University of Kansas
Utah Museum of Fine Arts, Salt Lake City NEW!
Battle Between Two Tritons, after Andrea Mantegna
Professional Tools:
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) 
(a welcome screen is displayed for a couple of seconds before the search results appear)
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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