1929Rockport Granite Company furnished all the hammered and polished stone for the entrance and exit of the Holland Tunnel in New York CityEconomy and Industry, Granite Industry, Infrastructure

Holland Tunnel, New York City, n.d. Cape Ann Museum Library & Archives, Photo 12728
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The Holland Tunnel project started in the early 1920s. As one of its final projects, the Rockport Granite Company sent its workers to supervise. They used new surfacing machines, replacing the work of twelve men.

Erkkila, Barbara H. Hammers on Stone: A History of Cape Ann Granite. 1st ed, TBW Books, 1980.
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