Question: Which author whose work has been adapted into 112 films also was a co-author for Open Range.

full_context: Document 1: The American (1927 film): The American, a.k.a. The Flag Maker, (1927) is a lost silent film western directed by J. Stuart Blackton and starring Bessie Love and Charles Ray.
Document 2: Zane Grey Museum: The Zane Grey Museum in Lackawaxen Township, Pennsylvania, United States, is a former residence of the author Zane Grey and is now maintained as a museum and operated by the National Park Service (NPS). It is located on the upper Delaware River and is on the National Register of Historic Places. It contains many photographs, artworks, books, furnishings, and other objects of interest associated with Grey and his family.
Document 3: 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. The film stars Betty Bronson, Lane Chandler, Fred Kohler, Bernard Siegel, Guy Oliver, Jim Corey and Buck Connors. The film was released on November 11, 1927, by Paramount Pictures.
Document 4: Zane Grey Estate: The Zane Grey Estate is a National Register of Historic Places structure (site #02001187) in Altadena, California. It was placed on the Register in 2002 for its association with author Zane Grey.
Document 5: The Seven Swans: The Seven Swans is lost 1917 silent film fantasy starring Marguerite Clark. Famous Players Film Company produced and J. Searle Dawley directed.
Document 6: Open Range (2003 film): Open Range is a 2003 American western film directed and co-produced by Kevin Costner, starring Robert Duvall and Costner, with Annette Bening, Michael Gambon, and Michael Jeter appearing in supporting roles. The film was the final on-screen appearance of Jeter, who died before it was released, and the film was dedicated to Jeter's memory, and to that of Costner's parents, Bill and Sharon.
Document 7: Louis L'Amour: Louis Dearborn L'Amour ( ; March 22 1908 –June 10 1988) was an American novelist and short story writer. His books consisted primarily of Western novels (though he called his work 'frontier stories'); however, he also wrote historical fiction ("The Walking Drum"), science fiction ("The Haunted Mesa"), non-fiction ("Frontier"), as well as poetry and short-story collections. Many of his stories were made into films and John Wayne once made the dubious assertion that L'Amour was the most interesting man in the world. L'Amour's books remain popular and most have gone through multiple printings. At the time of his death almost all of his 105 existing works (89 novels, 14 short-story collections, and two full-length works of nonfiction) were still in print, and he was considered "one of the world's most popular writers".
Document 8: Zane Grey: Pearl Zane Grey (January 31, 1872 – October 23, 1939) was an American dentist and author best known for his popular adventure novels and stories associated with the Western genre in literature and the arts; he idealized the American frontier. "Riders of the Purple Sage" (1912) was his best-selling book. In addition to the commercial success of his printed works, they had second lives and continuing influence when adapted as films and television productions. His novels and short stories have been adapted into 112 films, two television episodes, and a television series, "Dick Powell's Zane Grey Theater".
Document 9: Nevada (1927 film): Nevada is a 1927 American Western silent film directed by John Waters and starring Gary Cooper, Thelma Todd, and William Powell. Based on the novel "Nevada" by Zane Grey, the film is about a former outlaw hired to protect a ranch owner's daughter, which angers the ranch foreman who is in love with the girl. The villainous foreman spreads a rumor of his rival's dark past to the sheriff, and the former outlaw is soon on the run again. Eventually he captures a gang of cattle rustlers led by the foreman, and with his reputation restored, he marries the girl. This lavish Western film was remade in 1944 as "Nevada" starring Robert Mitchum—the only time Cooper and Mitchum played the same role.
Document 10: The Brute (1927 film): The Brute is a lost 1927 silent film western directed by Irving Cummings and starring Monte Blue. It was produced and distributed by Warner Brothers.
Document 11: Lewis Wetzel: Lewis Wetzel (February 24, 1763 -1808) was a frontiersman and Native American fighter who roamed the hills of western Virginia and Ohio. Wetzel County, West Virginia, is named for him. Zane Grey, the great Western novelist, wrote about Wetzel in his books "Spirit of the Border", "Betty Zane", and "The Last Trail". Wetzel is regarded as a hero by many Americans, a lesser-known version of Daniel Boone. He was accused in 1788 of the murder of peaceful Native Americans, but he escaped and there was no trial.
Document 12: Romer Zane Grey: Romer Zane Grey (October 1, 1909 - March 8, 1976) was the eldest son of novelist Zane Grey. Romer was born October 1, 1909 at Lackawaxen, Penn. Zane and Dolly Grey had three children: Romer, Betty, and Loren. Romer was named after an uncle Romer Carl Grey, known as Reddy Grey.
Document 13: Zane: Zane is a surname which was popularized as a given name through the popular American writer Zane Grey. Grey's given name was Pearl but he instead adopted his middle name, from his mother's family name, as a pen name.
Document 14: Zane Grey Cabin: The Zane Grey Cabin on the Rogue River in Oregon is a cabin built in 1926 by Zane Grey (1872–1939), the master author of the American West. Grey used it as a frequent retreat until 1935.
Document 15: Law of the Range: Law of the Range is a 1941 American film directed by Ray Taylor using a screenplay by Sherman L. Lowe which is based on a story by Charles E. Barnes. The film starred Johnny Mack Brown as Steve Howard, Fuzzy Knight as Chap, Nell O'Day as Mary O'Brien, Riley Hill as The Wolverine Kid, Janet Warren as Virginia O'Brien, Pat O'Malley as Mr. Howard, Hal Taliaferro as Tim O'Brien, Charles King as Henchman Walt, Ethan Laidlaw as Henchman Jeff Hobart, Jack Rockwell as Sheriff Henderson, Al Bridge as Jamison, Jerome Harte as Henchman Kurt, and Terry Frost as Sam Emery.
ground_truth: Zane Grey