Chugh, C P Design criteria for drill rigs : equipment and drilling techniques C. P. Chugh, Ken Steele, V. M. Sharma - Rotterdam A.A. Balkema 1996 - vi, 404 p. : ill. ; 25 cm ISBN: 9789054102571 Subjects--Topical Terms: BoringBoring machinery -- Design and construction Dewey Class. No.: 622.23 CHU