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National Wildlife Refuge Bird Checklists
http://www.npwrc.usgs.gov/resource/othrdata/chekbird/other/puerto.htm
Seasonal checklists for 4 refuges in PR.
Puerto Rico's Birds in Photographs
http://www.mindspring.com/~oberle/puertorico-birds.htm
Text, photos, and audio for 8 species from book/CD-ROM by Mark Oberle.