"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X79H-85Q : accessed 25 August 2017), Howard Calkins in household of Bert Calkins, Detroit (Districts 0001-0250), Wayne, Michigan, United States; citing enumeration district (ED) ED 225, sheet 4A, line 4, family 1, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1040; FHL microfilm 2,340,775.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q29Y-WG14 : 15 March 2016), Howard D Calkins, 1944; Burial, Troy, Oakland, Michigan, United States of America, White Chapel Memorial Park Cemetery; citing record ID 151261813, Find a Grave, http://www.findagrave.com.
"United States Headstone Applications for U.S. Military Veterans, 1925-1949", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV1Z-WQ5J : 17 May 2016), Howard D Calkins, .
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DNA Connections
It may be possible to confirm family relationships with Howard by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: