"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KM1B-5YZ : accessed 25 Sep 2012), Richard Trauernicht, Earl Election Precinct, Frontier, Nebraska, United States; citing enumeration district (ED) 32-5, sheet 1B, family 23, NARA digital publication T627, roll 2246