3 books
Laboratory Exercises in Structural and Historical Geology; A Laboratory Manual Based on Folios of the United States Geological Survey, for Use with CL
Studies in Geology; A Laboratory Manual Based on Topographic Maps and Folios of the United States Geological Survey, for Use with Classes in Physiographic and Structural Geology
Laboratory Exercises in Structural and Historical Geology; A Laboratory Manual Based on Folios of the United States Geological Survey, for Use with Classes in Structural and Historical Geology