Young, K. (1963). Upper cretaceous Ammonites from the Gulf Coast of the United-States. Bureau of Economic Geology; The University of Texas.
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Chicago-čujuhus (17. p.)
Young, Keith. Upper Cretaceous Ammonites from the Gulf Coast of the United-States. Austin: Bureau of Economic Geology; The University of Texas, 1963.
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MLA-čujuhus (9. p.)
Young, Keith. Upper Cretaceous Ammonites from the Gulf Coast of the United-States. Bureau of Economic Geology; The University of Texas, 1963.
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