REMOVE

1. Portrait photographs
2. Photographs
3. Nitrate negatives
4. negative
5. Genthe, Arnold
6. between 1915 and 1918

WHAT

1. Dancers. (1)
2. Group portraits (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. 1915 (1)
3. 1918 (1)
4. between 1915 and 1918 (1)