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General Research Division, The New York Public Library. "Cement concrete road. Huntington Drive, L. A. Co., Cal. Tamping subgrade 'Petrolithic Tamping Roller', 1912. (View no. 2)" The New York Public Library Digital Collections. 1900 - 1930. https://qa-digitalcollections.nypl.org/items/510d47da-deb9-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Cement concrete road. Huntington Drive, L. A. Co., Cal. Tamping subgrade 'Petrolithic Tamping Roller', 1912. (View no. 2)" New York Public Library Digital Collections. Accessed November 30, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-deb9-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1900 - 1930). Cement concrete road. Huntington Drive, L. A. Co., Cal. Tamping subgrade 'Petrolithic Tamping Roller', 1912. (View no. 2) Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-deb9-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-deb9-a3d9-e040-e00a18064a99 | title=
(still image)
Cement concrete road. Huntington Drive, L. A. Co., Cal. Tamping subgrade 'Petrolithic Tamping Roller', 1912. (View no. 2), (1900 - 1930)|author=Digital Collections, The New York Public Library |accessdate=November 30, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>