REMOVE

1. Photographs
2. gelatin silver print
3. cityscape
4. North American; American

WHAT

1. gelatin silver print (3)
2. landscape, mountains (1)

WHERE

1. North American; American (3)
2. Peru, Cuzco (1)
3. US, IL, Chicago (1)
4. US, PA, Philadelphia (1)

WHO

1. George Eastman House (3)
2. Callahan, Harry (1)
3. Krause, George (1)
4. Mertin, Roger (1)

WHEN

1. 1961 (1)
2. 1966 (1)
3. 1974 (1)