USGS · 5223002
An international standard for a mapping method in bird census work recommended by the International Bird Census committee
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S. Svensson, K. Williamson, C. Ferry, A.H. Joensen, D. Lea, H. Oelke, C.S. Robbins. 1970. An international standard for a mapping method in bird census work recommended by the International Bird Census committee. https://pubs.usgs.gov/publication/5223002
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