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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Industrial & political map of Pennsylvania : exhibiting the population, the principal resources of each county, and the valuation of property : the several Congressional districts, and the vote for presidential electors in 1840." The New York Public Library Digital Collections. 1844. https://digitalcollections.nypl.org/items/510d47da-efde-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Industrial & political map of Pennsylvania : exhibiting the population, the principal resources of each county, and the valuation of property : the several Congressional districts, and the vote for presidential electors in 1840." New York Public Library Digital Collections. Accessed March 26, 2025. https://digitalcollections.nypl.org/items/510d47da-efde-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1844). Industrial & political map of Pennsylvania : exhibiting the population, the principal resources of each county, and the valuation of property : the several Congressional districts, and the vote for presidential electors in 1840. Retrieved from https://digitalcollections.nypl.org/items/510d47da-efde-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-efde-a3d9-e040-e00a18064a99 | title=
(cartographic)
Industrial & political map of Pennsylvania : exhibiting the population, the principal resources of each county, and the valuation of property : the several Congressional districts, and the vote for presidential electors in 1840., (1844)
|author=Digital Collections, The New York Public Library |accessdate=March 26, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>