REMOVE

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

WHAT

1. Artists' studios. (1)
2. Artists. (1)
3. Nitrate negatives (1)
4. Portrait photographs (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. 1920 (1)
3. 1942 (1)
4. between 1920 and 1942 (1)