John Munro Longyear (English Wikipedia)

"United States Census, 1860". FamilySearch (Database). 1860. J W Longyear. Retrieved December 14, 2017.
"Michigan Death Certificates, 1921–1952". FamilySearch (Database). June 2, 1921. Howard Williams Longyear. Retrieved December 12, 2014.
"United States Passport Applications, 1795–1925". FamilySearch (Database). 1895. John M Longyear in entry for Mary H Longyear. Retrieved October 4, 2016.
"Michigan Marriages, 1822-1995". FamilySearch (Database). January 4, 1879. John M. Longyear and Mary H. Beacher. Retrieved February 10, 2018.
"United States Census, 1900". FamilySearch (Database). John M Longyear, Marquette city Ward 3, Marquette, Michigan, United States. Retrieved February 23, 2018.

loc.gov

Michigan State Medical Society; Burr, C. B. (1930). Medical History of Michigan. Minneapolis: Bruce Publishing. LCCN 31011995. Retrieved February 23, 2018 – via Library of Congress.

Michigan State Medical Society; Burr, C. B. (1930). Medical History of Michigan. Minneapolis: Bruce Publishing. LCCN 31011995. Retrieved February 23, 2018 – via Library of Congress.

Eggers, Leah (April 28, 2014). "Mrs. Mary Beecher Longyear (1851–1931)". Longyear Museum. Retrieved February 23, 2018.
support (May 28, 2013). "The Longyear Story". Longyear Museum. Retrieved February 23, 2018.

"New National Mining Museum". National Mining Hall of Fame. Retrieved December 14, 2022.

Berger, Adam (May 24, 2018). "Into the Wilderness with J.M. Longyear". The Mining Journal. Marquette, Michigan.

Stratton, Robert E. (April 22, 1975). "There Was No Place Like Home for the Longyears". The Milwaukee Journal. Part 1, p. 10. Retrieved June 24, 2013.

"Was Prominent Mining Man". Barre Daily Times. May 29, 1922. p. 2. Retrieved December 24, 2020 – via Newspapers.com.

"Longyear family of New York". The Political Graveyard. Archived from the original on December 28, 2009.
"Index to Politicians: Long-bey to Looker". The Political Graveyard.

"Longyear family of New York". The Political Graveyard. Archived from the original on December 28, 2009.