TY - RPRT TI - Impacts of vehicles on natural terrain at seven sites in the San Francisco Bay area AU - H. G. Wilshire AU - J. K. Nakata AU - S. Shipley AU - K. Prestegaard PY - 1978 DO - 10.1007/bf02430676 UR - https://pubs.usgs.gov/publication/70012508 ID - 70012508 ER -