共 91 条
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[2]
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[3]
The State of Canada’s Birds, 2012, pp. 1-36, (2012)
[4]
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[5]
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[6]
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Batt B.D.J., The Marsh Keepers’ Journey, pp. 1-256, (2012)
[8]
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[9]
Leitch W.G., Ducks and Men: 40 Years of Co-operation in Conservation, pp. 1-268, (1978)
[10]
The Duck Decline in the Northwest: A Report on the Prairie Duck-Breeding Region, pp. 1-42, (1933)