"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X3DT-Z6T : accessed 25 Sep 2014), Carroll D Volkman in household of Albert J Volkman, Little Sauk, Todd, Minnesota, United States; citing enumeration district (ED) 0024, sheet 7B, family 125, NARA microfilm publication T626, roll 1132.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KSLQ-V67 : accessed 25 Sep 2014), Carroll Volkmann in household of Albert J Volkmann, Little Sauk Township, Todd, Minnesota, United States; citing enumeration district (ED) 77-24, sheet 7B, family 124, NARA digital publication of T627, roll 1964.
"Minnesota, Death Index, 1908-2002," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/V489-681 : accessed 25 Sep 2014), Carroll Albert Volkman, 26 Sep 1982; citing "Minnesota, Death Index, 1908-2002," Ancestry.com; Douglas, Minnesota, record 2090192, certificate number 022087, Department of Health, Minneapolis.
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