20.O22 [Auber Junction and Little Duke Crossroads area, southeast of Nachtegaal] December 26, 1917
Covers an area equivalent to portions of squares O22 and 28 on the corresponding WWI map sheet 20. Negative roll 9B, photo 211. Annotations on recto: north arrow pointing to the upper-right. WWI Aerial Photograph Collection: Box 1, Envelope 70.