Your coordinates N37.47069 W93.27669 is Pleasant Hope Cemetery, not Coffman. Pleasant Hope Cemetery is on Cemetery Drive in Pleasant Hope and is 20+ miles away from Aldrich.
I will stop in Polk County Genealogical Society and see if they have any info on Coffman.
I'm posting 2 photo's. One is of the Coordinates N37.47069 W93.27669 and as you can see it is a large cemetery and I'm 100% sure it is Pleasant Hope Cemetery because I have been there before.
The other is a map "from" (A) Pleasant Hope Cemetery (your Coordinates) "to" (B)the location of Aldrich.
I'll get back to you. It might be a few days, not sure what days the Polk County Genealogical Society is open.. wish me luck :)