Clay Evans can't quite put his finger on exactly what made him decide to become a cowboy -- after all, growing up in Boulder, Colorado, he'd been keener on Batman than Roy Rogers -- but, at the age when other young men were off to college, he was clearly bitten by the cowboy bug. Attracted by the stern Marlboro Man resolve, the cowboy's rigid independence, the oft-ignored connection to the earth, Evans eventually found work on ranches in Montana,...