Source:Tarr-clay
From Pittsburgh Streets
Joel A. Tarr and Karen Clay. "Boom and bust in Pittsburgh natural gas history: Development, policy, and environmental effects, 1878–1920." Pennsylvania Magazine of History and Biography, vol. 139, no. 3, Oct. 2015, pp. 323–342. https://www.jstor.org/stable/10.5215/pennmaghistbio.139.3.0323.
