Notes

Partial contents: "First part: origin, general features of earth, underground waters, underground fires & volcanic activity, geysers, hot springs, and earthquakes. Part two: mines & quarries, each described under chapters on coal, oil, petroleum, metals, non-metals, etc., with diamond and precious stones comprising Chapter 7, p. 384-410... The third part of the book is devoted to caverns, tunnels, and excavations underground..."-​-​Gemology by J. Sinkankas, entry no. 1201 (JSL1201).