Dickinson P. Martin illustrated the fortieth book in the series of Oz books that was written by Elooise Jarvis McGraw and who?
Dick Martin (artist): Dickinson P. Martin (June 29, 1927 – February 14, 1990) was an artist from Chicago who illustrated a number of books related to The Oz books series, most notably, "Merry Go Round in Oz" (1963), the 40th and final title in the regular series, as well as many other children's books. Merry Go Round in Oz: Merry Go Round in Oz (1963) is the fortieth in the series of Oz books created by L. Frank Baum and his successors. Merry Go Round in Oz:  It was written by Eloise Jarvis McGraw and Lauren McGraw Wagner (her married name was dropped from reprinted editions after the marriage ended).
Lauren McGraw Wagner