RT Journal Article SR Electronic T1 AMERICA'S RENEWABLE RESOURCES: HISTORICAL TRENDS AND CURRENT CHALLENGES JF Landscape Journal FD University of Wisconsin Press SP 187 OP 188 DO 10.3368/lj.11.2.187 VO 11 IS 2 A1 Thalden, Barry YR 1992 UL http://lj.uwpress.org/content/11/2/187.abstract AB