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© The New York Public Library, 2024
The New York Public Library is a 501(c)(3) | EIN 13-1887440
R.U.R. ["Rossum's Universal Robots"]. Guild Tour Company (1928-1929)
Billy Rose Theatre Division, The New York Public Library. "Sylvia Field (Helena) and Albert Van Dekker (Radius, a robot)." The New York Public Library Digital Collections. 1928 - 1929. https://digitalcollections.nypl.org/items/510d47dd-fc66-a3d9-e040-e00a18064a99
Billy Rose Theatre Division, The New York Public Library. "Sylvia Field (Helena) and Albert Van Dekker (Radius, a robot)." New York Public Library Digital Collections. Accessed October 7, 2024. https://digitalcollections.nypl.org/items/510d47dd-fc66-a3d9-e040-e00a18064a99
Billy Rose Theatre Division, The New York Public Library. (1928 - 1929). Sylvia Field (Helena) and Albert Van Dekker (Radius, a robot). Retrieved from https://digitalcollections.nypl.org/items/510d47dd-fc66-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47dd-fc66-a3d9-e040-e00a18064a99 | title=
(still image)
Sylvia Field (Helena) and Albert Van Dekker (Radius, a robot)., (1928 - 1929)|author=Digital Collections, The New York Public Library |accessdate=October 7, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>