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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "At the testing chamber for motors at the Pratt and Whitney Aircraft Corporation. After the engine is set up inside the chamber the door is sealed tight and the engine run at full blast for hours on end as an engineer watches it thru the window, records" The New York Public Library Digital Collections. 1940. https://old-digitalcollections.nypl.org/items/312833e0-069f-013e-1499-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "At the testing chamber for motors at the Pratt and Whitney Aircraft Corporation. After the engine is set up inside the chamber the door is sealed tight and the engine run at full blast for hours on end as an engineer watches it thru the window, records" New York Public Library Digital Collections. Accessed September 25, 2026. https://old-digitalcollections.nypl.org/items/312833e0-069f-013e-1499-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). At the testing chamber for motors at the Pratt and Whitney Aircraft Corporation. After the engine is set up inside the chamber the door is sealed tight and the engine run at full blast for hours on end as an engineer watches it thru the window, records Retrieved from https://old-digitalcollections.nypl.org/items/312833e0-069f-013e-1499-0242ac110003
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/312833e0-069f-013e-1499-0242ac110003 | title=
(still image)
At the testing chamber for motors at the Pratt and Whitney Aircraft Corporation. After the engine is set up inside the chamber the door is sealed tight and the engine run at full blast for hours on end as an engineer watches it thru the window, records, (1940)|author=Digital Collections, The New York Public Library |accessdate=September 25, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>