TY  - RPRT
TI  - PTCOUNT - a Fortran-77 computer program to calculate the areal distribution of mapped data points using count-circle methodology
AU  - William Z. Savage
AU  - Jeffrey A. Coe
AU  - Ronald E. Sweeney
PY  - 2001
DO  - 10.3133/ofr012
UR  - https://pubs.usgs.gov/publication/ofr012
ID  - ofr012
ER  -