Scannell's New Jersey's First Citizens and State Guide, p. 518. J. J. Scannell, 1919. Accessed December 7, 2021. "William Hartwell Blackwell - Titusville - Fruitgrower and Assemblyman. Born at Washington's Crossing, N. J., on July 22, 1882; son of Charles E. and Sarah E. (Hartwell) Blackwell."
Boyes, Maria. "From Hollystone to Hopewell, Eco-Tourism and Conservation Comes to Mercer County", Preservation New Jersey. Accessed October 8, 2024. "According to the 2003 Hopewell Township Cultural Resource survey funded by NJSHPO, the manor house and barn are eligible for local, state and national designation because of the association with the Titus family as well as for the architecture of the house and barn. From this site, the family developed Titusville Village taking advantage of both the canal and the railroad along the river, which were integral to the success of Titusville and the Pleasant Valley farming district (a nationally recognized historic district)."
state.nj.us
Locality Search, State of New Jersey. Accessed January 7, 2015.
