00493nam a2200169Ia 4500082001900000100002200019245007300041260003100114300002000145500000500165690000600170700000500176952010100181964001700282921000900299999001500308  a510.9bF889.WS  aFreudenthal, Hans  aWeeding and sowing; preface to a science of mathematical educationb  aDordrechtbD. Reidelc1978  aix, 314p. Index  a  a   a  00104070aISIbISId1998-09-04l0o510.9 F889.WSpDP15804r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a8473  c8473d8473