I just finished Arlita Winston's biography, Heart-Cry, of her parents' missionary work in Sumatra in the 1940's. It is fascinating reading. You get a good sense of the pioneering work being done in the jungles of southeast Asia. Besides his missionary work, David Morken was among a group of leaders such as Dawson Troutman, Bob Pierce, Hubert Mitchell, and Dick Hillis who lead and started movements such as Youth for Christ, Navigators, and World Vision. The church library has a copy, and the bookstore has several copies for sale.