REMOVE

1. Nitrate negatives
2. Photographs
3. Portrait photographs
4. Library of Congress Prints a …
5. 1923
6. between 1915 and 1923

WHAT

1. Nitrate negatives (1)
2. Portrait photographs (1)
3. 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 1923 (1)