USGS · 5224484
Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest
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D.K. Niven, J.R. Sauer, G.S. Butcher, W.A. Link. 2004. Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest. https://pubs.usgs.gov/publication/5224484
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