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Date: 2010-12-23 11:07:22Phenology United States Citizen science United States Fish and Wildlife Service Ornithology Patuxent Wildlife Research Center Clinton Hart Merriam Biology Nature Conservation in the United States North American Bird Phenology Program Climatology | N.A. Bird Phenology Program E-Newlsetter December 2010Add to Reading ListSource URL: www.pwrc.usgs.govDownload Document from Source WebsiteFile Size: 138,00 KBShare Document on Facebook |