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McGee, E.S. and Hearn, B.C. 1986. Carbonated xenoliths from the Macdougal Springs mica peridotite diatreme: Inferences for upper mantle conditions in north central Montana. International Kimberlite Conference: Extended Abstracts. 4, 1 (Sep. 1986), 291–293. DOI:https://doi.org/10.29173/ikc1147.