20.O21 [Forest Farm and Bloodstone Corner] December 26, 1917
Covers an area equivalent to squares O20 and 21 on the corresponding WWI map sheet 20. Negative roll 9B, photo number 207. Annotations on recto: north arrow pointing to upper-left. "FOREST FM" and "BLOODSTONE CORNER" printed in red ink. WWI Aerial Photograph Collection: Box 1, Envelope 63.