TY  - RPRT
TI  - Sustaining visitor use in protected areas: Future opportunities in recreation ecology research based on the USA experience
AU  - Christopher A. Monz
AU  - David N. Cole
AU  - Yu-Fai Leung
AU  - Jeffrey L. Marion
PY  - 2009
DO  - 10.1007/s00267-009-9406-5
UR  - https://pubs.usgs.gov/publication/70003887
ID  - 70003887
ER  -