| Item Description: | At head of title: A Twentieth Century Fund study. |
|---|---|
| Physical Description: | 1530 p. : maps ; 21 cm. |
| Bibliography: | Bibliography: v. 3, p. 2225-2248. Bibliographical footnotes. |
| Item Description: | At head of title: A Twentieth Century Fund study. |
|---|---|
| Physical Description: | 1530 p. : maps ; 21 cm. |
| Bibliography: | Bibliography: v. 3, p. 2225-2248. Bibliographical footnotes. |