TY  - RPRT
TI  - Population trends of the purple martin in North America, 1966 - 1986
AU  - J.R. Sauer
AU  - M. K. Klimkiewicz
AU  - Sam Droege
PY  - 1987
UR  - https://pubs.usgs.gov/publication/5220747
ID  - 5220747
ER  -