"The Mineral Belt" is a 3 volume, 8.75"x11" hardcover set written by David S. Digerness and published by Sundance Books (Silverton, CO). The books focus on the history of railroads serving a mineral-rich area, popularly known as the Front Range Mineral Belt, centered at Georgetown, Colorado (west of Denver). There are many illustrations throughout, some in color, and each volume has a folded map in a pocket at the back.
Volume I: Old South Park - Denver to Leadville, An Illustrated History featuring the Denver, South Park & Pacific Railroad and the Gold-and-Silver Mining Industry of the Fabulous Mineral Belt of Colorado (416 pages, 1979 2nd printing)
Volume II: Old South Park - Across the Great Divide (416 pages, 1980 2nd printing)
Volume III: Georgetown - Mining - Colorado Central Railroad (416 pages, 1982 first printing)
Bonus Book! You'll also receive a related book about Colorado mining history, "An Empire in Silver," a 224 page, 8.75"x11" hardcover written by Robert L. Brown and published in 1984 by Sundance Books.
The books are in very good condition. The covers are protected by mylar sleeves and show minimal wear, the interiors are unmarked, the bindings firm (though Vol. II's text block is starting to sag).