REMOVE

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

WHAT

1. Educational facilities. (1)
2. Nitrate negatives (1)
3. Photographs (1)
4. negative (1)

WHO

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

WHEN

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