upper right in image: DETECT / AB. / 2; lower right in image: RIAI; upper center in image: NELSON; signed by artist, lower right, in graphite: Gangolf; by artist, lower left, in graphite: 8
Marks and Labels
stamp, verso lower 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. 15.