[Dr. Walter J. Clark, talking to group at International Conference on Photo Speed, Munich]
Transparency
Unidentified
Maker
[Dr. Walter J. Clark, talking to group at International Conference on Photo Speed, Munich]
1939
transparency, gelatin on glass
Overall: 3 1/4 × 4 in. (8.3 × 10.2 cm)
Gift of Walter J. Clark
1980.0737.0007
