TY  - RPRT
TI  - Point counts of birds in bottomland hardwood forests of the Mississippi Alluvial Valley: Duration, minimal sample size, and points versus visits
AU  - W.P. Smith
AU  - D.J. Twedt
AU  - D.A. Wiedenfeld
AU  - P.B. Hamel
AU  - R.P. Ford
AU  - R.J. Cooper
PY  - 1993
UR  - https://pubs.usgs.gov/publication/5230239
ID  - 5230239
ER  -