REMOVE

1. negative
2. Nitrate negatives
3. Portrait photographs
4. Library of Congress Prints a …
5. 1917
6. between 1917 and 1929

WHAT

1. Dancers. (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. 1929 (1)
3. between 1917 and 1929 (1)