TY  - RPRT
TI  - What is a population?
AU  - W.R. Munns
AU  - W. N. Beyer
AU  - W.G. Landis
AU  - C. Menzie
PY  - 2002
UR  - https://pubs.usgs.gov/publication/5224191
ID  - 5224191
ER  -