Study of the geology and ore deposits of the Breckenridge District in Colorado.

From introduction: "Report based chiefly on the field work prosecuted during 1905, 1906, 1907, and 1909. It is primarily a characterization of the several major distribution areas or life zones."

"This paper presents the best-known methods of improving the grain-sorghum crops on the farms where they are grown. These methods are simple and inexpensive of time or money, and are therefore within the reach of all farmers. More attention to the bettering of the quality and yields will be repaid as fully in these crops as in other cereals." -- p. 2. Sorghum crops can be improved for drought resistance, earliness, stature, productivity, and adaptability to machine techniques.