TY - RPRT TI - Non-native plant invasions in managed and protected ponderosa pine/Douglas-fir forests of the Colorado Front Range AU - Paula J. Fornwalt AU - M. R. Kaufmann AU - L. S. Huckaby AU - J. M. Stoker AU - Thomas J. Stohlgren PY - 2003 DO - 10.1016/s0378-1127(02)00456-5 UR - https://pubs.usgs.gov/publication/1015033 ID - 1015033 ER -