"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X384-ZWX : accessed 10 May 2022), Richard Blaschko in household of John Blaschko, Lexington, Le Sueur, Minnesota, United States; citing enumeration district (ED) ED 15, sheet 6A, line 41, family 138, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1104; FHL microfilm 2,340,839.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSL6-VBQ : 25 November 2019), Richard Blaschko, Lexington Township, Le Sueur, Minnesota, United States; citing enumeration district (ED) 40-15, sheet 12B, line 49, family 245, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1933.
Richard Albert Blaschko (1911-1989) on Find A Grave: Memorial #92824261 retrieved 23 July 2021
"Minnesota Death Index, 1908-2002," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V4Q4-1WT : 4 December 2014), Richard A. Blaschko, 08 Mar 1989; from "Minnesota Death Index, 1908-2002," database, Ancestry (http://www.ancestry.com : 2001); citing Hennepin, Minnesota, record 2314833, certificate number 006315, Minnesota Department of Health, Minneapolis.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JT9K-Q2L : 10 January 2021), Richard Blaschko, 08 Mar 1989; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).