Best of
Geology
1972
Gem Minerals of Idaho: With Field Trip Maps
John A. Beckwith - 1972
It is not a textbook of mineralogy and, so far as possible, avoids technical terminology. However, it does contain information of general value on the physical and optical characteristics of minerals, as well as facts concerning history, lore, and fashioning of many of the gems.
Sand And Sandstone
F.J. Pettijohn - 1972
Includes new techniques and their utility, new literature, new illustrations, new problems.
River of Tears: The Rise of the Rio Tinto Zinc Mining Corporation
Richard West - 1972