REMOVE

1. Nitrate negatives
2. Portrait photographs
3. Genthe, Arnold
4. Library of Congress Prints a …
5. not before 1922

WHAT

1. Nitrate negatives (1)
2. Photographs (1)
3. Portrait photographs (1)
4. negative (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. 1922 (1)
3. 1924 (1)
4. not before 1922 (1)