"Illinois, County Marriages, 1810-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KFL8-7KP : 4 November 2017), Richard A. Law and Lydia Ahrens, 18 Feb 1912; citing Kendall, Illinois, United States, county offices, Illinois; FHL microfilm 1,403,534.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9S6-GR6 : accessed 17 August 2018), Lydia Lau in household of Richard Lau, Luck, Polk, Wisconsin, United States; citing enumeration district (ED) ED 26, sheet 4B, line 65, family 90, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2605; FHL microfilm 2,342,339.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMY1-WNC : accessed 17 August 2018), Lydia A Law in household of Richard A Law, Osage, Osage Township, Mitchell, Iowa, United States; citing enumeration district (ED) 66-13, sheet 2B, line 42, family 42, 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 1183.
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