Books by Robert W. Butler
Pacific Flyway
Pacific Flyway
The distribution of fish-eatin
The distribution of fish-eating, wading, and raptorial birds in the Gulf of Panama, October 1991
The Ecology and status of mari
The Ecology and status of marine and shoreline birds in the Strait of Georgia, British Columbia
The birds of the Creston Valle
The birds of the Creston Valley and southeastern British Columbia