Given in memory of Jameson Garrett Brown by the Rotary Club of Aggieland with matching support from the Sara and John H. Lindsey '44 Fund.

Sand, clay and rock have to be excavated for a variety of purposes, such as dredging, trenching, mining (including deep sea mining), drilling, tunnel boring and

This book is the outgrowth of a week-long conference on sandstone organized by the authors, first held at Banff, Alberta, in 1964 under the auspices of the Albe