This township map comes from the book, Arkansas Township Digest: Minor Civil Divisions, 1820-1990, compiled by Desmond Walls Allen. The book shows how townships developed, grew, changed, split apart and evolved just like counties. It is available from Arkansas Research.
Also, here is the 1936 Detailed Township Map from the Arkansas State Highway Commission. (This map is very large, but is so detailed that individual rural houses are shown.)
Updated 9 Aug 2008