David S. Castle Company
Abilene, TX
David S. Castle
David S. Castle, Jr.
The American Institute of Architects Archives
Architects Roster questionnaire, 1946, contains information about the firm and its key personnel. (Note-large pdf, 26MB)
University of North Texas Special Collections
David S. Castle Architectural Drawings Collection, 1914-1962
Finding aid to the collection is available at https://findingaids.library.unt.edu/?p=collections/findingaid&id=877. Digitized drawings are available through the Portal to Texas History https://texashistory.unt.edu/explore/collections/DVDCAD/