Cancer treatment : efforts to more fully utilize the Pacific yew's bark : statement of James Duffus III, director, Natural Resources Management Issues, Resources, Community, and Economic Development Division, before the Sub. on Fisheries and Wildlife Conservation and the Environment, Com. on Merchant Marine and Fisheries; the Sub. on National Parks and Public Lands, Com. on Interior and Insular Affairs; and the Sub. on Forests, Family Farms, and Energy, Com. on Agriculture, House of Representatives /