Which author whose work has been adapted into 112 films also was a co-author for Open Range.
Open Range (1927 film): Open Range is a lost 1927 American Western silent film directed by Clifford Smith and written by Roy Briant, Zane Grey, J. Walter Ruben and John Stone. Zane Grey:  His novels and short stories have been adapted into 112 films, two television episodes, and a television series, "Dick Powell's Zane Grey Theater".
Zane Grey