This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant mark

Excerpt from The Journal of Geology, Vol. 31: A Semi-Quarterly Magazine of Geology and Related Sciences; January-December, 1923 Business correspondence Should b

Excerpt from The Journal of Geology, Vol. 7: A Semi-Quarterly Magazine of Geology and Related Sciences; January to June, 1899 Fig. I. Cross-section from Sonora,

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced