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- [S137]  Iowa, State Census Collection, 1836-1925, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2007;), Database online.
 
Record for Arthur Martinson 
 
  
- [S137]  Iowa, State Census Collection, 1836-1925, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2007;), Database online.
 
Record for Bertha Martinson 
 
  
- [S16]  1920 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2010;), Database online. Year: 1920; Census Place: Sioux City Precinct 11, Woodbury, Iowa; Roll: T625_520; Page: 21B; Enumeration District: 227; Image: .
 
Record for Bertha Martinson 
 
  
- [S2]  1900 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2004;), Database online. Year: 1900; Census Place: Sioux City, Woodbury, Iowa; Roll: T623_467; Page: 9B; Enumeration District: 173.
 
Record for Bertha Martinson 
 
  
- [S4]  1910 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2006;), Database online. Year: 1910; Census Place: Sioux Ward 5, Woodbury, Iowa; Roll: ; Page: ; Enumeration District: ; Image: .
 
Record for Bertha Martinson 
  
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