REMOVE

1. Horseback riding.
2. Nitrate negatives
3. Genthe, Arnold
4. Library of Congress Prints a …
5. between 1911 and 1936
6. 1936

WHAT

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

WHO

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

WHEN

1. 1869-1942 (1)
2. 1911 (1)
3. between 1911 and 1936 (1)