This rare set of 9 volumes looks closely at the geology of the Western territories. It is designed around the exploration for ore deposits and for coal. 1867 was of Nebraska. 1868 for Wyoming. 1869 for Colorado and New Mexico. 1870 was for Wyoming. 1871 was for Montana. 1872 was for portions of Montana Wyoming Idaho and Utah. 1873 was for land embracing Colorado. 18 7475 and 76 covered Colorado and parts of adjacent states. 1877 covered Idaho and Wyoming. Each of the dates listed above are not the date of publication, but are rather the years the exploration took place. Additionally there is a book by Frank Chambers on Hayden and his men which is primarily a photographic record of their survey through the western territories. Many maps and plates included