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You searched for: Place United States of America Remove constraint Place: United States of America Time Period 1950-1999 Remove constraint Time Period: 1950-1999
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North American Breeding Bird Survey Routes penn-state

1966-present. Canadian Wildlife Service U.S. Fish and Wildlife Service U.S. Department of the Interior; now at USGS Patuxent Wildlife Research Center. The North American Breeding Bird Survey (BBS), which is coordinated by the Biological Resources Division and Canadian Wildlife Service, is a primar...