"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MN3G-NV4 : accessed 22 Nov 2012), Robert C Grove in household of Margaret C Grove, Maryland, United States; citing p. 13, family 105, NARA microfilm publication M593, FHL microfilm 0552095.
"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MNQ1-P21 : accessed 22 Nov 2012), Edward S. Grove in household of Margarett Grove, Sharpsburg, Washington, Maryland, United States; citing sheet 1B, family 3, NARA microfilm publication T9-0516.