[S621] Census - IA, Polk - 1900 Fed, Iosa, Polk, (National Archives and Records Administration, 2004), T623, roll 453, Des Moines, enumeration district (ED) 0066, p. 1A, dwelling 8, family 9, William Benson, accessed 2 Dec 2013 (Reliability: 2), 2 Dec 2013.