"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDVB-BFJ : 12 April 2016), Rasmus Richardson in household of Hannah Richardson, Iowa, United States; citing p. 8, family 61, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,919.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9L8-YFD : accessed 11 November 2017), Erasmus Richardson, Knox Township, Pottawattamie, Iowa, United States; citing enumeration district (ED) 150, sheet 4A, family 68, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,456.
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DNA Connections
It may be possible to confirm family relationships with Erasmus by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Erasmus:
~2.34% ~3.12%Jo McCaleb :
23andMe, yourDNAportal JMCb4852946
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AncestryDNA, Ancestry member jcrockett
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Family Tree DNA Family Finder, GEDmatch T413897[compare], yourDNAportal JMCb4852946, FTDNA kit #549851