REMOVE

1. Nitrate negatives
2. negative
3. Horseback riding.
4. between 1896 and 1942
5. 1896

WHAT

1. Horseback riding. (1)
2. Nitrate negatives (1)
3. Photographs (1)

WHO

1. Genthe, Arnold (1)
2. Library of Congress Print … (1)

WHEN

1. 1869-1942 (1)
2. 1942 (1)
3. between 1896 and 1942 (1)