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National research project on reemployment opportunities and recent changes in industrial techniques
General Research Division, The New York Public Library. "Track walker" The New York Public Library Digital Collections. 1938. https://qa-digitalcollections.nypl.org/items/6fbd6940-ca1a-0130-5161-58d385a7bbd0
General Research Division, The New York Public Library. "Track walker" New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/6fbd6940-ca1a-0130-5161-58d385a7bbd0
General Research Division, The New York Public Library. (1938). Track walker Retrieved from https://qa-digitalcollections.nypl.org/items/6fbd6940-ca1a-0130-5161-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/6fbd6940-ca1a-0130-5161-58d385a7bbd0 | title=
(still image)
Track walker, (1938)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>