TY  - RPRT
TI  - Population trends from the American woodcock singing-ground survey, 1970-88
AU  - John R. Sauer
AU  - James B. Bortner
PY  - 1991
DO  - 10.2307/3809154
UR  - https://pubs.usgs.gov/publication/5222575
ID  - 5222575
ER  -