Barber Mansion Foundation.

ID: 5516 ~ Source: National Register Nomination Form. ~ Creator: Haley Schriber, John Milner Associates Preservation, Arlington, Virginia and John Twomey, U.S. Secret Service, Washington, D.C. ~ Date: July 2021.
This file appears in: United States Naval Observatory (USNO) Historic District: The USNO is the only American institution devoted to positional astronomy and timekeeping.

Brick foundation remnants of Building 150 (from nomination form).

This file appears in: United States Naval Observatory (USNO) Historic District: The USNO is the only American institution devoted to positional astronomy and timekeeping.