TY  - RPRT
TI  - Probabilistic and statistical relationships between number of vehicles and number of visitors at a geologic site in a national park
AU  - Robert A. Crovelli
PY  - 1994
DO  - 10.3133/ofr94560
UR  - https://pubs.usgs.gov/publication/ofr94560
ID  - ofr94560
ER  -