Iowa, Delayed Birth Records, 1856-1940 at Ancestry.com
US Census Year: 1900; Census Place: Kane, Pottawattamie, Iowa; Roll: 455; Page: 4B; Enumeration District: 0139; FHL microfilm: 1240455
US Census Year: 1910; Census Place: Chicago Ward 26, Cook, Illinois; Roll: T624_271; Page: 12B; Enumeration District: 1118; FHL microfilm: 1374284
US Census Year: 1920; Census Place: Chicago Ward 18, Cook (Chicago), Illinois; Roll: T625_329; Page: 9A; Enumeration District: 1036
US Census Year: 1930; Census Place: Chicago, Cook, Illinois; Page: 23B; Enumeration District: 0237; FHL microfilm: 2340159
US Census Year: 1940; Census Place: Chicago, Cook, Illinois; Roll: m-t0627-00932; Page: 6B; Enumeration District: 103-352
US Census United States of America, Bureau of the Census; Washington, D.C.; Seventeenth Census of the United States, 1950; Record Group: Records of the Bureau of the Census, 1790-2007; Record Group Number: 29; Residence Date: 1950; Home in 1950: Chicago, Cook, Illinois
Cook County, Illinois Marriage Indexes, 1912-1942 at Ancestry.com
Wisconsin Vital Records Office. iWisconsin Death Index, 1959-67, 1969-97/i. Madison, Wisconsin, USA: Wisconsin Department of Health.
Find a Grave, database and images (https://www.findagrave.com/memorial/91190198/margaret-rita-clark: accessed 19 March 2023), memorial page for Margaret Rita Cochran Clark (25 Apr 1891–26 Aug 1973), Find a Grave Memorial ID 91190198, citing Graceland Cemetery, Chicago, Cook County, Illinois, USA; Maintained by Tressia (contributor 47642449).
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