Note 5 — Chapter I · - ETHNICAL PERIODS.
Reading edition
Lewis and Clarke (1805) found plank in use in houses among the tribes of the Columbia River.—Travels, Longman’s Ed., 1814, p. 503. Mr. John Keast Lord found “cedar plank chipped from the solid tree with chisels and hatchets made of stone,” in Indian houses on Vancouver’s Island.—Naturalist in British Columbia, I, 169.