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Dahl, Peter S.; Frei, Robert (1998). Step-leach Pb-Pb dating of inclusion-bearing garnet and staurolite, with implications for Early Proterozoic tectonism in the Black Hills collisional orogen, South Dakota, United States. Geology, 26(2), pp. 111-114. Geological Society of America 10.1130/0091-7613(1998)026<0111:SLPPDO>2.3.CO;2
