Howard L Hartman

HOWARD L. HARTMAN, PhD, was Drummond Chair and professor of Mining Engineering at the University of Alabama in Tuscaloosa. JAN M. MUTMANSKY, PhD, is Professor Emeritus of Mining Engineering at Pennsylvania State University in University Park. The authors also coauthored Mine Ventilation and Air Conditioning, Third Edition (with R. V. Ramani and Y. J. Wang), published by Wiley.