D. Johansen

Empire of Columbia

W. O. Clough, D. Johansen, C. M. Gates, 1958 .

Peter Skene Ogden's Snake Country journal, 1826-27

D. Johansen, Peter Skene Ogden, K. Davies, 1962 .

Empire of the Columbia: A History of the Pacific Northwest

D. Johansen, C. M. Gates, 1967 .

The Oregon Steam Navigation Company: An Example of Capitalism on the Frontier

D. Johansen, 1941 .