Irving, A.J., and R.W. Carlson. “Mantle Xenoliths in Potassic Magmas from Montana: Sr, Nd and Os Isotopic Constraints on the Evolution of the Wyoming Craton Lithosphere”. International Kimberlite Conference: Extended Abstracts, vol. 5, Feb. 1991, pp. 183-5, doi:10.29173/ikc2505.