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Harlan et al. 1997
Harlan, S.S., Geismann, J.W. and Snee, L.W. (1997). Paleomagnetic and 40Ar/39Ar geochronologic data from late Proterozoic mafic dikes and sills, Montana and Wyoming. United States Geological Survey, Professional Paper 16pp.
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United States Geological Survey, Professional Paper
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