Description
Item Description: | At head of title: United States. Department of the Interior. Ray Lyman Wilbur, secretary. Office of education. William John Cooper, commissioner. Published also as thesis (PH.D) University of Pennsylvania. |
Physical Description: | v, 160 p. incl. tables, diagrs, forms. 23 cm. |
Bibliography: | Bibliography: p. 153-155. Bibliographical footnotes. |