Johnsgard, P. A. (2011). Sandhill and whooping cranes: Ancient voices over America's wetlands. University of Nebraska Press.
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Dyfyniad Arddull Chicago
Johnsgard, Paul A. Sandhill and Whooping Cranes: Ancient Voices over America's Wetlands. Lincoln [Neb.]: University of Nebraska Press, 2011.
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Dyfyniad MLA
Johnsgard, Paul A. Sandhill and Whooping Cranes: Ancient Voices over America's Wetlands. University of Nebraska Press, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.