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The Manufacturer and builder: a practical journal of industrial progress
General Research Division, The New York Public Library. "Figs. 1-4 Natural soil" The New York Public Library Digital Collections. 1871-06. https://digitalcollections.nypl.org/items/1d3fa2a0-3e03-013c-09c9-0242ac110002
General Research Division, The New York Public Library. "Figs. 1-4 Natural soil" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/1d3fa2a0-3e03-013c-09c9-0242ac110002
General Research Division, The New York Public Library. (1871-06). Figs. 1-4 Natural soil Retrieved from https://digitalcollections.nypl.org/items/1d3fa2a0-3e03-013c-09c9-0242ac110002
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/1d3fa2a0-3e03-013c-09c9-0242ac110002 | title=
(still image)
Figs. 1-4 Natural soil, (1871-06)
|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>