Organization and conduct of forest insect aerial surveys in Oregon and Washington,

Mode of access: Internet.

Life-insurance sales in the Pacific coast states, 1923-1942,

Mode of access: Internet.

Forest resources of the ponderosa pine region of Washington and Oregon /

Investigation conducted by the Pacific Northwest forest and range experiment station. cf. p. ii.

Memoir, historical and political, on the northwest coast of North America, and the adjacent territories : illustrated by a map and a geographical view of those countries.

References: Howes, U.S.IANA, no. G.389.