Vos, W.P., and M.E. McCallum. 1991. “Application of Simple Paramagnetic Susceptibility to Rapid Discrimination of Ilmenite Compositions in Exploration for Kimberlite in the Colorado - Wyoming Province, USA”. International Kimberlite Conference: Extended Abstracts 5 (February):443-45. https://doi.org/10.29173/ikc2598.