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SPEAR, L.B., AINLEY, D.G., HARDESTY, B.D., HOWELL, S.N.G. & WEBB, S.W. 2004. Reducing biases affecting at-sea surveys of seabirds: Use of multiple observer teams.
Marine Ornithology 32: 147
- 157
http://doi.org/10.5038/2074-1235.32.2.616
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