REMOVE

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

WHAT

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

WHO

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

WHEN

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