"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M85K-R3W : accessed 29 January 2015), Mina Vinstra in household of G Fraistre, Chicago, ward 5, Cook, Illinois, United States; citing family 4205, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).