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- U.S. Geological Survey Geographic Names Information System: Diorite, Michigan
- "Marquette County". Jim Forte Postal History. Archived from the original on 3 April 2015. Retrieved 15 March 2015.
- U.S. Geological Survey Geographic Names Information System: Diorite Post Office (historical)
- Chicago and North Western Railway Company (1908). A History of the Origin of the Place Names Connected with the Chicago & North Western and Chicago, St. Paul, Minneapolis & Omaha Railways. p. 65.
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