[International Conference on Photo Speed, Munich, Dr. Walter J. Clark pointing to blackboard]

[International Conference on Photo Speed, Munich, Dr. Walter J. Clark pointing to blackboard]

Digitized film strip
Transparency

[International Conference on Photo Speed, Munich, Dr. Walter J. Clark pointing to blackboard]

1939
transparency, gelatin on glass
Overall: 3 1/4 × 4 in. (8.3 × 10.2 cm)
Gift of Walter J. Clark
1980.0737.0006

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