The "Joseph Stillman Pierce Yard" is also known as Rehoboth Historic Cemetery #16. There are 35 interments. More info can be found here and here.
Please be considerate of the residents and the neighbors.
Using the above information or a walk around the cemetery (we recommend the 1st method since there seem to be some conflicting dates if you try it as a field puzzle), the cache can be found here:
N 41 A.B0
W 71 C.D1
A: Daniel F Barney died November 4, 18A
B: William Goff was born in 1B(+1)0
C: Nathan Pierce died November 4, 18C
D: John H. Pierce died June D(+3), 1847
You can check your answers for this puzzle on GeoChecker.com.