New, Lower Price!
Proceedings of "Bat
Gate Design: A Technical Interactive Forum" that was held in Austin, Texas, March 4-6, 2002.
Why Do We Protect Mines and Caves
Closure Design: Part 1
Closure Design: Part 2
Mointoring and Maintenance.
by Kimery C. Vories, Dianne Throgmorton, and Anna Harrington
xviii + 434 pages, softbound