In 1892 a stocky Danish immigrant named Magnus Jensen rode into south-central Montana. He liked what he saw and staked his future on the ranch he would carve out there. Today, Dan Aadland and his wife, Emily, live on the ranch built by Jensen, Emily's grandfather. More than a century has passed, but the nature of ranching in Montana is little changed. Sensitive to the timelessness of the land, author Aadland approaches his ranching life as Thoreau approached life at Walden Pond. In "Sketches from the Ranch," Aadland brings ranching to life within the framework of one recent year. In simple...