February 26, 1870: First pneumatic powered subway line in New York City(aps.org)
aps.org
February 26, 1870: First pneumatic powered subway line in New York City
https://www.aps.org/archives/publications/apsnews/201302/physicshistory.cfm
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https://www.aps.org/archives/publications/apsnews/201302/physicshistory.cfm
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