Rowdy of the "Cross L"

Classic western. According to Wikipedia: "Bertha Muzzy Sinclair or Sinclair-Cowan, née Muzzy (November 15, 1871 - July 23, 1940), best known by her pseudonym B. M. Bower, was an American novelist who wrote fictional stories about the American Old West. . . She wrote 57 Western novels, several of which were turned into films."