Books by Georgetown College Observatory (Washington, D.C.)
USAF - Georgetown solar eclips
USAF - Georgetown solar eclipse project
... Supplementary notes to the
... Supplementary notes to the Atlas stellarum variabilium
First chart and catalogue for
First chart and catalogue for observing Nova Persei
Observations of variable stars made in the years 1884-1890
The photochronograph and its applications
Annals of the astronomical obs
Annals of the astronomical observatory of Georgetown college, D.C.