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Date: 2012-10-26 10:48:24Natural history Ornithology North American Bird Phenology Program Roger Tory Peterson Peterson Field Guides Birdwatching Phenology Field guide Leopold and Loeb Science Biology Animal identification | N.A. Bird Phenology Program E-NewsletterAdd to Reading ListSource URL: www.pwrc.usgs.govDownload Document from Source WebsiteFile Size: 544,37 KBShare Document on Facebook |