Bonanza Tahoe-based "Ponderosa" theme park from 1967–2004; a line of American Character action figures in 1966–1967; Aladdin lunch buckets and thermos bottles in 1966–1968; View Master slide sets in 1964, 1971; Ponderosa tin cups from 1967–2004; a series of Hamilton collector plates in 1989–1990; and most recently, Breyer Fiftieth Anniversary Ponderosa Stable sets, with horses and Cartwright figures in 2009–2011. Fourteen "Bonanza" novels have been published: "Bonanza: A Novel" by Noel Loomis (1960); "Bonanza: One Man With Courage" by Thomas Thompson (1966); "Bonanza: Killer Lion" by Steve Frazee (1966); "Bonanza: Treachery Trail" by Harry Whittington (1968); "Winter Grass" by Dean Owen
U Lazy S Ranch split some of the acreage into farms. In 1949, Lott started flying an airplane to drive the cattle and spray herbicide. In the 1950s, the land was faced with a draught. By 1954, Lott planted 1,400 acres of guar to improve the land. He was also the first Texas rancher to use a roto-pitter to break up the rangeland. Two years later, in 1956, Lott's range improvement program had worked. In 1965, Macy split her section of the ranch and renamed it the Running M Ranch. Meanwhile, the U Lazy S Ranch was managed by Lott's son, Jack Lott. By