TY  - RPRT
TI  - The 1992 and 1993 summary of the North American Breeding Bird Survey
AU  - B.G. Peterjohn
AU  - J.R. Sauer
AU  - W.A. Link
PY  - 1994
UR  - https://pubs.usgs.gov/publication/5222713
ID  - 5222713
ER  -