Yes, you would need to subscribe to some sites if you want to do the search yourself.LDS (http://www,familysearch.org) is a free site, which may help you.Be careful, a lot of info can be erroneous.It would be up to you to verify the info, if possible.
Although LDS shows Frances Acock, I believe her maiden name is ADCOCK. Adcock families are neighboring Cundiff's in some censuses. Wilkins Cundiff in 1870 is shown to be Wilson in 1860. Robert'smiddle initial is W., as shown in the 1850 census.
LDS shows this:(I'm sure there's more)
Robert W. CundiffCompact Disc #87Pin #848780 Birth:18 Sep 1814Place: Muhlenberg, Kentucky Death:24 May 1863Place: