LEADER 00933nam0-22003131i-450- 001 990002002690403321 005 20040429151238.0 035 $a000200269 035 $aFED01000200269 035 $a(Aleph)000200269FED01 035 $a000200269 100 $a20030910d1961----km-y0itay50------ba 101 0 $aeng 102 $aUS 105 $ay---a---001yy 200 1 $aBiological education in american secondary schools 1890-1960$fPaul De Hart Hurd 210 $aWashington$cAmerican Institute of Biological Sciences$d1961 215 $a263 p.$d23 cm 225 1 $aCurriculum study bullettin$v1 610 0 $aBiologia 676 $a574.07 700 1$aHurd,$bPaul DeHart$084593 801 0$aIT$bUNINA$gRICA$2UNIMARC 901 $aBK 912 $a990002002690403321 952 $a61 II B.4/23$b2083$fDAGEN 959 $aDAGEN 996 $aBiological education in american secondary schools 1890-1960$9403205 997 $aUNINA