Paintings in Museums and Public Art Galleries:
Philadelphia Museum of Art (On the zoom-in page, use the slider bar to magnify the image) 4 works by Philippe Otto Runge online
Wallraf-Richartz-Museum, Cologne, Germany (mostly in German) NEW!  Die Genien auf der Lichtlilie
Professional Tools:
Artprice
Pictures from Image Archives:
Philippe Otto Runge in the Art Renewal Center
Philippe Otto Runge in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
Ciudad de la Pintura (in Spanish) 
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
Wikipedia, the "Open Content" Encyclopedia
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