20.O8 [East of Boonehoek and West of Zwartegat] December 26, 1917
Covers an area equivalent to portions of squares O8 and 9 on the corresponding WWI map sheet 20. Negative roll 9B, photo 227. Annotations on recto: north arrow pointing to the upper-right. WWI Aerial Photograph Collection: Box 1, Envelope 87.