• [S1] Personal knowledge of Gary Maynard Olson (Rochester, Minnesota), 26 Apr 2015.
  • [S2] 1860 US Census.
  • [S3] 1870 US Census.
  • [S4] 1880 US Census.
  • [S5] 1900 US Census.
  • [S6] 1910 US Census.
  • [S7] 1920 US Census.
  • [S8] 1940 US Census.
  • [S9] 1930 US Census.
  • [S10] Find A Graven.pub.
  • [S11] Wisconsin Death Index, 1959-1997, www.ancestry.com.
  • [S12] Minneosta Birth Certificates Index, online . Hereinafter cited as Minneosta Birth Certificates Index.
  • [S13] California Death Index 1940-1997, online . Hereinafter cited as California Death Index 1940-1997.
  • [S14] WWI Draft Registrations, www.ancestry.com.
  • [S15] Minnesota Death Index, www.mnhs.org.
  • [S16] WW II Draft Registration Cards, www.ancestry.com.
  • [S17] Gene Nelson, "Stellingwerf Family History" (unknown compiler address). Unknown comments. Hereinafter cited as "Stellingwerf Family History."
  • [S18] Kris Sandefur, "Mulder Brons Zoeller Zimmer Family Research" (posted on Ancestry.com). Unknown comments. Hereinafter cited as "Mulder Brons Zoeller Zimmer Family."