REMOVE

1. Acetate negatives
2. negative
3. Horseback riding.

WHAT

1. Acetate negatives (1)
2. Horseback riding. (1)
3. Photographs (1)
4. Portrait photographs (1)

WHO

1. Library of Congress Print … (1)
2. Unknown (1)

WHEN

1. 1911 (1)
2. 1942 (1)
3. between 1911 and 1942 (1)