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  - 1988
UR  - https://pubs.usgs.gov/publication/5224797
ID  - 5224797
ER  -