Journal kept by David Douglas during his travels in North America 1823-1827, together with a particular description of thirty-three species of American oaks and eighteen species of Pinus, with appendices containing a list of the plants introduced by Douglas and an account of his death in 1834. Published under the direction of the Royal Horticultural Society - Douglas, David; Royal Horticultural Society (Great Britain) (London, W. Wesley & Son, 1914, 1914)
https://www.biodiversitylibrary.org/bibliography/19661
Keywords: Botany|Description and travel|North America|Northwestern States|Oak|Pine