1920 US Census has Robert Lempka and Mary Graba living in Nemaha, Johnson Co., Nebraska. He owns his home, and it lists immigration year as 1889. This census also finds his father, Emanuel, living in the home at 76 years of age. This would put his birth year about 1844, conflicting with other estimate at 1839.
Record via FamilySearch, accessed 30 Dec 2014.
abt. 1920