"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, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M2N3-TM6 : accessed 22 Nov 2012), Anna M Grove in household of Philip Grove, Sharpsburg, Washington, Maryland; citing sheet 14A, family 44, NARA microfilm publication T624, FHL microfilm 1374582.