REMOVE

1. Photographs
2. negative
3. Group portraits
4. Library of Congress Prints a …
5. between 1918 and 1920
6. 1918

WHAT

1. Dancers. (1)
2. Glass negatives (1)
3. Group portraits (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. between 1918 and 1920 (1)