Paintings in Museums and Public Art Galleries:
J. Paul Getty Museum, Los Angeles Flowers and Beetles, 1582 A Hare in the Forest, 1585
Kunsthistorisches Museum Databank, Vienna (in German) 
Hans Hoffmann at the National Gallery of Art, Washington D.C. Red Squirrel, 1578
Commercial Galleries:
Lempertz Auction Gallery, Cologne, Germany -- Highlights from Past Sales Der Feldhase, 1582
Professional Tools:
Artarchiv Sample Artist Symbols + Monograms Scroll down to monogram 469
Pictures from Image Archives:
Hans Hoffmann in the Art Renewal Center
Hans Hoffmann in the Web Gallery of Art 
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
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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