Biblio
“An Optical Photograph”. The Astrophysical Journal XLI (No. 3). The Astrophysical Journal.
. 1915. Douglass, AE_An Optical Photograph_1915.pdf (13.21 MB)“An Automatic Optical Photograph, Abstract”. Publications Of The Astronomical Society Of The Pacific. Publications Of The Astronomical Society Of The Pacific.
. 1919. Douglass, AE_An Automatic Optical Photograph_1919.pdf (1.21 MB)