Lewis Clark's Field guide to wild flowers of the sea coast in the Pacific Northwestand photographed by Lewis J. Clark2004PDF9.4 MB
Lewis Clark's Field Guide To Wild Flowers Of The Arid Flatlands In The Pacific Northwestand photographed by Lewis J. Clark1975PDF8.3 MB
The great expedition of Lewis and Clarkas recorded by Judith Edwards, pictures by Sally Wern Comport2003PDF4.3 MB