20.O15 [Strovendorp and Nachtegaal Area] December 18, 1917
Covers an area equivalent to squares O15, 16, 21 and 22 on the corresponding WWI map sheet 20. Negative roll 9B, photo 172. Annotations on recto: north arrow pointing to the left. Annotations on verso: "Left Div. Front" pencilled and underlined along the west edge of the photo. Partial pencilled circle labelled "STOVENDORP" [correct spelling Strovendorp]. Placement of annotations corresponds to their exact locations on recto. WWI Aerial Photograph Collection: Box 1, Envelope 29.