REMOVE

1. Photographs
2. Group portraits
3. Nitrate negatives
4. Library of Congress Prints a …
5. Unknown
6. between 1896 and 1942

WHAT

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

WHO

1. Library of Congress Print … (1)

WHEN

1. 1896 (1)
2. 1942 (1)
3. between 1896 and 1942 (1)