TY  - RPRT
TI  - A variable circular-plot method for estimated bird numbers
AU  - R.T. Reynolds
AU  - J. M. Scott
AU  - R.A. Nussbaum
PY  - 1980
DO  - 10.2307/1367399
UR  - https://pubs.usgs.gov/publication/5221568
ID  - 5221568
ER  -