TY  - RPRT
TI  - Checklist and "Pollard Walk" butterfly survey methods on public lands
AU  - Ronald A. Royer
AU  - Jane E. Austin
AU  - Wesley E. Newton
PY  - 1998
DO  - 10.1674/0003-0031(1998)140[0358:capwbs]2.0.co;2
UR  - https://pubs.usgs.gov/publication/1001787
ID  - 1001787
ER  -