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| Utgitt
| Washington : U.S. Govt. Print. Off. , 1940
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| Omfang
| xxii, 124 p. : incl. maps, tables, diagrs., forms. 13 pl.
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| Opplysninger
| At head of title: Federal Works Agency, John M. Carmody, Administrator. Work Projects Administration, F. C. Harrington, Commissioner. Corrington Gill, Assistant Commissioner. Division of Research, Howard B. Meyers, Director.. - Includes bibliographical references.
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| Emner
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| ISBN
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