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Minnesota's rocks and waters : a geological story
Schwartz, George Melvin
Bok Engelsk 1963
Minnesota's rocks and waters : a geological story
Schwartz, George Melvin
Bok Engelsk 1954
Geology and underground waters of north-eastern Minnesota
Thiel, George A.
Bok Engelsk 1947
Pleistocene man in Minnesota : a fossil Homo sapiens
Albert Ernest Jenks
Bok Engelsk 1936
Geology
Emmons, William Harvey
Bok Engelsk 1932