REMOVE

1. negative
2. Nitrate negatives
3. Photographs
4. Educational facilities.
5. Library of Congress Prints a …
6. between 1915 and 1918

WHAT

1. Educational facilities. (1)
2. Nitrate negatives (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)