Considerations Upon the Art of Mining William Hypolitus Keating

Excerpt from Considerations Upon the Art of Mining: Reflections on Its Actual State in Europe, and an Introduction of This Art Into the United States

The importance of a science, or of an art, may probably, in most cases, be considered as Это и многое другое вы найдете в книге Considerations Upon the Art of Mining (William Hypolitus Keating)