REMOVE

1. Glass negatives
2. Genthe, Arnold
3. Library of Congress Prints a …
4. not before 1916 or 1917

WHAT

1. Glass negatives (2)
2. Photographs (2)
3. Portrait photographs (2)
4. negative (2)

WHO

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

WHEN

1. 1869-1942 (2)
2. 1916 (2)
3. 1919 (2)
4. not before 1916 or 1917 (2)