Appendix B. Estimated population trend (, percentage per year over interval 1966-1999) for species ofNorth American birds estimated from the North American Breeding Bird Survey.

2016-08-04T23:40:50Z (GMT) by John R. Sauer William A. Link
Estimated population trend (, percentage per year over interval 1966-1999) for species ofNorth American birds estimated from the North American Breeding Bird Survey.