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Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "At the signal box ready to sound the gas alarm; The sounding of the gas alarm quickly and accurately, when gas was detected, meant saving the lives of many men." The New York Public Library Digital Collections. 1919. https://qa-digitalcollections.nypl.org/items/510d47de-7bc3-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "At the signal box ready to sound the gas alarm; The sounding of the gas alarm quickly and accurately, when gas was detected, meant saving the lives of many men." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47de-7bc3-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1919). At the signal box ready to sound the gas alarm; The sounding of the gas alarm quickly and accurately, when gas was detected, meant saving the lives of many men. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47de-7bc3-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47de-7bc3-a3d9-e040-e00a18064a99 | title=
(still image)
At the signal box ready to sound the gas alarm; The sounding of the gas alarm quickly and accurately, when gas was detected, meant saving the lives of many men., (1919)
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