On a search of Findagrave.com, I found these burials in the Spring Grove Cemetery in Anthony, Harper Co, KS:
b. 1856 d. 1947
Long, Frances (Rhodes)
b. Aug. 20, 1907 d. Aug. 6, 1998
Long, Frank M.
b. May 14, 1900 d. Sep. 9, 1985
The person who posted the burials is email@example.com
and you can go to Findagrave, search and find any one of those burials, click on the poster's name (judy mayfield) and leave a public message for her. Perhaps she knows more about your Long (and Rhodes) family or can give you some other kind of head start.