REMOVE

1. Photographs
2. autochrome
3. National parks & reserves.
4. Library of Congress Prints a …
5. 1912
6. 1906

WHAT

1. Autochromes (1)
2. Canyons. (1)
3. Landscape photographs (1)
4. National parks & reserves … (1)

WHO

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

WHEN

1. 1869-1942 (1)
2. between 1906 and 1912 (1)