Paintings in Museums and Public Art Galleries:
Fine Arts Museums of San Francisco The Holy Family
Paul Troger in the Louvre Museum Database, Paris (only available in French) The Prodigal Son
Cleveland Museum of Art, Ohio The Holy Family
Harvard University Art Museums, Massachusetts NEW!
National Gallery of Armenia, Yerevan, Armenia Venus and Amures, pencil drawing
National Gallery of Slovenia, Ljubljana (in Slovenian) 
Österreichische Galerie Belvedere, Vienna NEW!
Residenzgalerie Salzburg, Austria Cure of Old Tobias
Professional Tools:
Artprice
Artarchiv Sample Artist Signatures Scroll down to signature 522
Pictures from Image Archives:
Paul Troger in the Art Renewal Center
Paul Troger in the Web Gallery of Art  Christ Comforted by an Angel, ca.1730
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
Ciudad de la Pintura (in Spanish) 
Farbdia Archiv (Color Slide Archive) (in German)  Thousands of photographs of fresco cycles and wall decorations in churches and other buildings in and around Germany. Click "Galerie" for a normal overview; click "digilib" to zoom in.
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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