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Report on the Geological Survey of the State of Iowa
其他書名
Embracing the Results of Investigation Made During Portions of the Years 1855, 56 & 57. Volume I, Part II, Palaeontology
出版Authority of the legislature of Iowa, 1858
URLhttp://books.google.com.hk/books?id=PTt60AEACAAJ&hl=&source=gbs_api