REMOVE

1. negative
2. Library of Congress Prints a …
3. Genthe, Arnold
4. between 1923 and 1929
5. 1929

WHAT

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

WHO

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

WHEN

1. 1869-1942 (1)
2. 1923 (1)
3. between 1923 and 1929 (1)