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<br />. <br /> <br />United States Department of the Interior <br />W ALTER J. HICKEL, Secretary <br /> <br /> <br />" <br /> <br />Geological Suryey <br />William T. Pecora, Director <br /> <br />. <br /> <br />'"X' <br /> <br />First printing 1968 <br /> <br />Second printing 1969 <br /> <br />. <br /> <br />Free on application to the U.S. Geological Survey, Washington, D.C. 20242 <br />