REMOVE

1. silver gelatin print
2. Photographs
3. Horse racing
4. First half of the twentieth …

WHAT

1. silver gelatin print (2)

WHERE

1. New Orleans (La.) (2)
2. North American; American (2)

WHO

1. Horse racing (2)
2. Louisiana State Museum (2)
3. Teunisson, John N. (2)

WHEN

1. 1900 (2)
2. 1949 (2)
3. First half of the twentie … (2)