"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD4J-99X : 12 April 2016), Frederick Nusbaum, Frederick county, part of, Frederick, Maryland, United States; citing family 540, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN3F-ZKG : 12 April 2016), Federick Nusbaum in household of F W Nusbaum, Maryland, United States; citing p. 22, family 181, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,086.