"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD4X-B9Z : 12 April 2016), Joseph L Routzhan in household of Joseph Routzhan, Fredericktown, Frederick, Maryland, United States; citing family 674, 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-D69 : 12 April 2016), Joseph E Routzan, Maryland, United States; citing p. 11, family 85, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,086.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNQ2-8Z6 : 15 August 2017), Jos L Routzahn, Frederick, Frederick, Maryland, United States; citing enumeration district ED 69, sheet 102C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0509; FHL microfilm 1,254,509.