REMOVE

1. Photographs
2. albumen print
3. North American; American
4. 1861

WHAT

1. albumen print (2)
2. landscape, military (1)
3. occupation, soldiers (1)

WHERE

1. North American; American (2)
2. US, CA, Yosemite (1)
3. US, VA, Petersburg (1)

WHO

1. George Eastman House (2)
2. O'Sullivan, Timothy H. (1)
3. Watkins, Carleton E. (1)

WHEN

1. 1861 - 1862 (1)
2. 1862 (1)