"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XCZD-Z9C : accessed 19 June 2022), Regis Mullen in household of Martin J Mullen, Midland, Beaver, Pennsylvania, United States; citing enumeration district (ED) ED 70, sheet 14A, line 16, family 284, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1997; FHL microfilm 2,341,731.