TY  - RPRT
TI  - Management practices that concentrate visitor activities: Camping impact management at Isle Royale National Park, USA
AU  - Jeffrey L. Marion
AU  - T. A. Farrell
PY  - 2002
DO  - 10.1006/jema.2002.0584
UR  - https://pubs.usgs.gov/publication/5224192
ID  - 5224192
ER  -