- Blackford, W. W. (William Willis), 1831-19051
- Bowen & Co.1
- Boyd, Charles Rufus, 1841-19031
- Clifford, Alan F., 1919-19951
- Clifford, Shirley Mittleman, 1923-19971
- Clifford-Wysor family1
- Dickey, S. M.1
- Filson, John, ca. 1747-17881
- Geological Survey. Water Resources Division (U.S.)1
- Historic Urban Plans (Firm)1
- Julius Bien & Co.1
- Mount Vernon Ladies' Association of the Union1
- Mullet, John1
- United States George Washington Bicentennial Commission1
- United States. Department of Agriculture1