"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V6C8-J6R : accessed 4 October 2017), Matilde Perez De Vargas in household of Manuel Vargas, Llanos Tunas, Cabo Rojo, Puerto Rico; citing enumeration district (ED) ED 7, sheet 16B, line 77, family 281, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2643; FHL microfilm 2,342,377.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KFJX-WN4 : accessed 4 October 2017), Matilde Pérez De Várgas in household of Manuel Vargas, Llanos Tuna, Cabo Rojo, Puerto Rico; citing enumeration district (ED) 34-13, sheet 18B, line 59, family 299, 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 4618.
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