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Leonard, Olen E. (Olen Earl), 1909-
Washington : Scarecrow Press, 1952.
Witt, Lawrence
Land Economics, 1954, Vol.30 (2), p.193-193
Keller, Frank L.
Geographical Review, 1954, Vol.44 (2), p.303-304
Rees, T. Ifor
International Affairs (Royal Institute of International Affairs 1944-), 1953-07, Vol.29 (3), p.405-405