"Strong mental faculties and a vigorous constitution" were among the attributes of Zenas Leonard, according to the publisher of the 1839 edition of this book, which the Bison Books edition reproduces. In the spring of 1830, Leonard, a native of Clearfield, Pennsylvania, "ventured to embark in an expedition across the Rocky Mountains, in the capacity of clerk to the company. The last letter received by his parents, left him at the extreme white settlement...