The Maritime History of the Great Lakes
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Decade:  1950 
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Green's Great Lakes Directory 
Text  1951,   ... of iron ore were removed from the Mather "A" shaft in 1950. An additional 48,118 tons were taken from the mine's "B" shaft, located at Negaunee, Mich. The "A" shaft is at nearby Ishpeming. Mining observers say figures for the "A" shaft alone set a world record...
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