Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia Girl in a Field, 1857 First Earnings, 1878
Musée d'Orsay Collection Database, Paris 2 works by Ludwig Knaus online
Frye Art Museum, Seattle NEW! 3 paintings online
Harvard University Art Museums, Massachusetts NEW!
The Walters Art Museum, Maryland NEW!
Pictures from Image Archives:
Ludwig Knaus in the Art Renewal Center
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)
Ciudad de la Pintura (in Spanish) 
Ludwig Knaus at The Athenaeum 
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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