[1]
Tompkins, L. and Ramsay, R. 1991. The Boa Esperanga and Cana Verde Pipes; Corrego D’Anta, Minas Gerais, Brazil. International Kimberlite Conference: Extended Abstracts. 5, (Feb. 1991), 429–431. DOI:https://doi.org/10.29173/ikc2593.