REMOVE

1. negative
2. Library of Congress Prints a …
3. Genthe, Arnold
4. between 1923 and 1929
5. 1929
6. 1869-1942

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. 1923 (1)
2. between 1923 and 1929 (1)