REMOVE

1. Photographs
2. Sleds & sleighs.
3. National parks & reserves.
4. Nitrate negatives

WHAT

1. National parks & reserves … (1)
2. negative (1)
3. Nitrate negatives (1)
4. Sleds & sleighs. (1)
5. Snow. (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. 1903 (1)
3. 1906 (1)
4. between 1903 and 1906 (1)