"United States Census, 1940," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:VRDB-PNG : March 14, 2018), Barbara D Cowell in household of Leland C Cowell, Tract 35, Denver, Election District Z, Denver, Colorado, United States; citing enumeration district (ED) 16-292A, sheet 14B, line 76, family 301, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 493.