Photo crop exposure date: unknown. Exposure date (or window) of subject photo: 1918. Subject: Photo crop of a Southern Pacific Lines photo card with handwritten message along margins. Photo on card is ca. 1917. View is north and elevated across plaza park almost certainly from the Gallagher Building (1877) at NE corner of Blum and Alamo. Margin message mentions Kelly Field #1 (opens 1917) and Line “C” (Existed June to November 1918).