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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Two Sentinels, 312 ft. high, 69 ft. in in circumference. Mammoth Tree Grove, Calaveras County, California." The New York Public Library Digital Collections. 1850 - 1930. https://digitalcollections.nypl.org/items/510d47e0-2f79-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Two Sentinels, 312 ft. high, 69 ft. in in circumference. Mammoth Tree Grove, Calaveras County, California." New York Public Library Digital Collections. Accessed January 19, 2025. https://digitalcollections.nypl.org/items/510d47e0-2f79-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1850 - 1930). Two Sentinels, 312 ft. high, 69 ft. in in circumference. Mammoth Tree Grove, Calaveras County, California. Retrieved from https://digitalcollections.nypl.org/items/510d47e0-2f79-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e0-2f79-a3d9-e040-e00a18064a99 | title=
(still image)
Two Sentinels, 312 ft. high, 69 ft. in in circumference. Mammoth Tree Grove, Calaveras County, California., (1850 - 1930)|author=Digital Collections, The New York Public Library |accessdate=January 19, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>