REMOVE

1. Nitrate negatives
2. Steamboats.
3. Cities & towns.
4. Photographs
5. Library of Congress Prints a …
6. 1920

WHAT

1. Cities & towns. (1)
2. Nitrate negatives (1)
3. negative (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. 1926 (1)
3. between 1920 and 1926 (1)