Texas Rocks and Minerals: An Amateur's Guide, by R. M. Girard. 109 p., 74 figs., 1 table, 2 maps, 2 charts, index, 1964. Eleventh reprinting, September 2018. ISSN: 0363-4132. ISBN: 978-1-970007-32-9. Print
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A companion to Texas Fossils, this classic "little blue book" has guided countless rock collectors, tourists, students and teachers, and property owners to a greater appreciation of the rocks and minerals of Texas:
"Texas has a great variety of rocks and minerals—some are common and others are not. This book is designed to aquaint you with some of them and to tell you in a nontechnical way what they are like, some of the places where they are found, and how they are used. Although we do not know exactly how all of the rocks and minerals formed, some of the ideas about their origin are mentioned."
Girard, R. M., 1964, Texas Rocks and Minerals: An Amateur's Guide: The University of Texas at Austin, Bureau of Economic Geology, Guidebook 6, 109 p.