REMOVE

1. Photographs
2. landscape, river
3. landscape, waterfalls
4. albumen print
5. people, at work
6. North American; American

WHAT

1. albumen print (1)
2. landscape, camp (1)
3. landscape, river (1)
4. landscape, waterfalls (1)

More 

WHERE

1. North American; American (1)
2. US, ID (1)

WHO

1. George Eastman House (1)
2. O'Sullivan, Timothy H. (1)

WHEN

1. 1868 (1)
2. September, 1868 (1)