TY - RPRT TI - Natural resource assessment: an approach to science based planning in national parks AU - C.G. Mahan AU - J.P. Vanderhorst AU - J.A. Young PY - 2009 DO - 10.1007/s00267-009-9292-x UR - https://pubs.usgs.gov/publication/70034917 ID - 70034917 ER -