00933nam0-22003131i-450-99000200269040332120040429151238.0000200269FED01000200269(Aleph)000200269FED0100020026920030910d1961----km-y0itay50------baengUSy---a---001yyBiological education in american secondary schools 1890-1960Paul De Hart HurdWashingtonAmerican Institute of Biological Sciences1961263 p.23 cmCurriculum study bullettin1Biologia574.07Hurd,Paul DeHart84593ITUNINARICAUNIMARCBK99000200269040332161 II B.4/232083DAGENDAGENBiological education in american secondary schools 1890-1960403205UNINA