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Helmstaedt, L. and Doig, R. 1973. Eclogite nodules from kimberlite pipes of the Colorado Plateau - samples of subducted Franciscan-type oceanic lithosphere. International Kimberlite Conference: Extended Abstracts. 1, (Aug. 1973), 171–172. DOI:https://doi.org/10.29173/ikc876.