TY  - RPRT
TI  - Population trends of black terns from the North American Breeding Bird Survey, 1966-1996
AU  - B.G. Peterjohn
AU  - J.R. Sauer
PY  - 1997
DO  - 10.2307/1521612
UR  - https://pubs.usgs.gov/publication/5223499
ID  - 5223499
ER  -