signed by artist, lower right, in graphite: Gangolf; by artist, lower left, in graphite: 23/55
Marks and Labels
stamp, verso center, in black ink: R
Ruth Cole Kainen [1929-2009], Washington DC; gift to NGA 2012.
- Rathenau, Ernest. Im Memoriam Paul Gangolf. Berlin: Euphorin Verlag, 1964, no. 40.