Janssen, R. B. (1987). Birds in Minnesota. Published by the University of Minnesota Press for the James Ford Bell Museum of Natural History.
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Dyfyniad Arddull Chicago
Janssen, Robert B. Birds in Minnesota. Minneapolis, MN: Published by the University of Minnesota Press for the James Ford Bell Museum of Natural History, 1987.
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Dyfyniad MLA
Janssen, Robert B. Birds in Minnesota. Published by the University of Minnesota Press for the James Ford Bell Museum of Natural History, 1987.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.