National Academy of Design(28)
M. Knoedler & Co., New York, NY(21)
Artistic Ventures, West Haven, CT(10)
Jewish Museum, New York, NY(7)
Carnegie Institute / Department of Fine Arts(6)
Deutsches Exilarchiv 1933-1945(6)
Deutsche Effecten- und Wechsel-Bank(5)
The Museum of Modern Art, New York, NY(5)
M. M. Warburg-Brinckmann, Wirtz und Co.(4)
American Academy and Institute of Arts and Letters(3)
Galerie Fritz Gurlitt, Berlin(3)
Time Equities, New York, NY(3)
USA / Immigration and Naturalization Service(3)