General technical report PNW-(series). PNW-38. Research natural area needs in Pacific Northwest, contribution to land-use planning, report on natural area needs workshop, Nov. 29-Dec. 1, 1973, Wemme, Oreg. [with list of literature cited; by] C. T. Dyrness, Jerry F. Franklin, Chris Maser, Stanton A. Cook, James D. Hall, and Glenda Faxon.