00450nam a2200145Ia 4500001001100000005001700011008004100028050001500069090001000084245011300094260003600207300002500243650002100268999001500289000000640420251012174616.0  721219s1954    nyua          000 0 eng00aGF31b.B6800a304.214aThe challenge of man's future;ban inquiry concerning the condition of man during the years that lie ahead.   aNew York,bViking Pressc1954.   a290 pbillusc22 cm. 0aHuman geography.  c7168d7168