Here is the information you are looking for.

Section D row #1 north to south

Mary A. Wilhite 1887-1971
Chas L. Wilhite 1877-1948 DVS
Frances P. Wilhite 1919-1989
Frank E. Wilhite 1910-1979 DVM

I don't have OBs of the Wilhites at this point in time (I'm gradually working on it though) and unfortunately I don't have time to look them up at the Manning Monitor. The Manning Monitor doesn't have the staff to do this research either.

Manning obituaries.
http://199.120.116.1/~bkienast/memorial/mem.htm

This web page shows the layout of the Manning Cemetery.
http://www.davidkusel.com/manning125/citizens/cemetery.htm