Lectures on physical geography, 1880
Lectures on physical geography, 1880
Lectures on physical geography, 1888
Letters on Alaska Boundary, 1886-1892
Letters on Alaska Boundary, 1888
Letters on Alaska Boundary, 1889-1900
Letters on Behring Sea Matters , 1890
Letters on Behring Sea Matters , 1891
Letters on Behring Sea Matters , 1893
Letters, 1856-1857
Letters, 1856-1857
Letters, 1858
Letters, 1858