Abandoned Mined Lands Survey Demonstration: Indiana and Cambria Counties, Pennsylvania. Appendix D--deep Mine Tabulations.
Mentz-JW; Gorton-WT; Yuill-CB; Ahnell-G
For Reference Only At Bureau Libraries :465 pages
Volume 3 of this eight-volume report supplements volumes 1-2, 4 and 6-7. Appendix d gives an explanation of the underground mine opening classification system, mine opening classes, and sealing cost data in Indiana and Cambria Counties, Pennsylvania.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
Skelly and Loy