Creator
- A. Hoen & Co.1
- A. Zeese & Co.1
- Blackford, W. W. (William Willis), 1831-19051
- Bowen & Co.1
- Clifford, Alan F., 1919-19951
- Clifford, Shirley Mittleman, 1923-19971
- Clifford-Wysor family1
- 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
- P.S. Duval & Son1
- Pennsylvania. Department of Internal Affairs1