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- [S50] Ancestry.com, 1920 United States Federal Census, (Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2009. Images reproduced by FamilySearch. For details on the contents of the film numbers, visit the following NARA web page: NARA. Note: Enumeration Districts 819-839 on roll 323 (Chicago C), Year: 1920; Census Place: Crocker, Polk, Iowa; Roll: T625_507; Page: 1B; Enumeration District: 71; Image: 173. (Reliability: 3).
- [S49] Ancestry.com, 1910 United States Federal Census, (Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2006. For details on the contents of the film numbers, visit the following NARA web page: NARA.Original data - United States of America, Bureau of the Census. Thirteenth Census of the United), Year: 1910; Census Place: Crocker, Polk, Iowa; Roll: T624_418; Page: 10B; Enumeration District: 67; Image: 705. (Reliability: 3).
- [S55] Ancestry.com, Iowa State Census Collection, 1836-1925, (Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2007.Original data - Microfilm of Iowa State Censuses, 1856, 1885, 1895, 1905, 1915, 1925 as well various special censuses from 1836-1897 obtained from the State Historical Society of Iowa v) (Reliability: 3).
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