20.V7 [Berthier, Gravel, Van Dyck, Rubens, and Memling Farms Southwest of Schaap-Balie] December 6, 1917
Covers an area equivalent to portions of squares V1, 7, and 8 on the corresponding WWI map sheet 20. Negative roll 9B, photo 91. Annotations on recto: north arrow pointing slightly left of straight up with an "x" on the opposite edge of the photo. WWI Aerial Photograph Collection: Box 1, Envelope 11.