Remarks On the Geology of the Valley of Mackenzie River

With Figures and Descriptions of Fossils from That Region, in the Museum of the Smithsonian Institution, Chiefly Collected by the Late Robert Kenniscott, Esq » 

With Figures and Descriptions of Fossils from That Region, in the Museum of the Smithsonian Institution, Chiefly Collected by the Late Robert Kenniscott, Esq «