Literary Remains of David Douglas, Botanist of the Oregon Country. by F. G. Young
A Brief Memoir of the Life of Mr. David Douglas, with Extracts from His Letters. by Sir W. J. Hooker
Sketch of a Journey to the North-Western Parts of the Continent of North America during the Years 1824-25-26-27 [reprinted from The Companion to the Botanical Magazine, 1836]. by David Douglas
"Recollections and Opinions of an Old Pioneer"--Continued. by Peter H. Burnett