REMOVE

1. Dancers.
2. negative
3. Glass negatives
4. Portrait photographs
5. Library of Congress Prints a …
6. between 1915 and 1918

WHAT

1. Glass negatives (2)
2. Photographs (2)
3. Portrait photographs (2)

WHO

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

WHEN

1. 1869-1942 (2)
2. 1915 (2)
3. 1918 (2)
4. between 1915 and 1918 (2)