REMOVE

1. Nitrate negatives
2. negative
3. Artists' studios.
4. Library of Congress Prints a …
5. 1920
6. between 1920 and 1942

WHAT

1. Artists' studios. (1)
2. Artists. (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. 1942 (1)
3. between 1920 and 1942 (1)