https://catalogue-scientifique.canada.ca/record=3639583~S6*frc
Rechercher Fallon, J; Rechercher Sauer, John R; Rechercher Hines, James E; Rechercher Gough, G; Rechercher Thomas, I
USGS Patuxent Wildlife Research Center, 1999
Data are developed from the North American Breeding Bird Survey Program. A joint U.S./Canadian venture run and managed by Patuxent Wildlife Research Center...
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