Glad you hit pay dirt with Edmund...What luck,finding a cache of letters that old...
One name I forgot to include yesterday(?)--who may be located nearer than the others to "Edmund's stomping grounds"--and therefore perhaps more likely to be re- lated:
Viola Raynolds,b. 5April 1888...d. 15 Feb. 1970, at Sulphur Springs, Hopkins Co, TX--SS#466-60-6883... I think this listing came from the SSDI.
Sulphur Springs, as you'll find from a good road map, or an Internet map program, is about 270 miles NNE of San Marcos--296 miles by road--and perhaps 30 miles ENE of Dallas.It is the county seat of Hopkins County.