REMOVE

1. Portrait photographs
2. Nitrate negatives
3. negative
4. Genthe, Arnold
5. Library of Congress Prints a …
6. between 1934 and 1942

WHAT

1. Artists. (1)
2. Group portraits (1)
3. Nitrate negatives (1)
4. Photographs (1)
5. Portrait photographs (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. 1934 (1)
3. 1942 (1)
4. between 1934 and 1942 (1)