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View A Partial Report on the Geology of Western Texas: Consisting of a General Geological Report and ... By George Gettz Shumard ,Geological and Agricultural Survey of Texas 
A Partial Report on the Geology of Western Texas: Consisting of a General Geological Report and ...
By George Gettz Shumard ,Geological and Agricultural Survey of Texas
View Bibliography of North American Geology for 1912: With Subject Index By John Milton Nickles,United States Geological Survey 
Bibliography of North American Geology for 1912: With Subject Index
By John Milton Nickles,United States Geological Survey