Ball, Stephen L. Quarryface and borehole surveying: an integrated solution - Antofagasta Universidad de Antofagasta, Departamento de Ingenierķa de Minas 1992 - pp. 308-348 ilus. Subjects--Topical Terms: CANTERASMINERIA A CIELO ABIERTOPERFORACION Universal Decimal Class. No.: R/061.3:622.271.3(83)/C71/2|15