REMOVE

1. Photographs
2. negative
3. Paintings
4. Library of Congress Prints a …
5. Genthe%2C Arnold
6. between 1896 and 1942

WHAT

1. Horses. (1)
2. Nitrate negatives (1)
3. Portrait photographs (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. 1932 (1)
3. 1942 (1)
4. between 1932 and 1942 (1)