REMOVE

1. Photographs
2. Glass negatives
3. negative
4. Library of Congress Prints a …
5. not before 1915 Dec
6. 2

WHAT

1. Glass negatives (1)
2. Portrait photographs (1)

WHO

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

WHEN

1. -2 (1)
2. 1869-1942 (1)
3. not before 1915 Dec (1)