Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1958.MIT Institute Archives copy: includes a rev. abstract and two additional graphs. Also includes typed letter signed, Nick Short to Dear Bill [William H. Dennen], 1958 Apr. 11, discussing the finished graphs and the recommended changes in the abstract.Vita. "June 1958."Includes bibliographical references (leaves 212-217).by Nicholas Martin Short.Ph.D.