00558nam a2200157Ia 450000500170000000800410001702000160005804100080007408200150008210000200009724501050011726000450022230000150026750000260028265000920030820191122150212.0190710s9999    xx            000 0 und d  a0-90442-074  aeng  a375.5 AC:2  aArchenhold W. F 0aCognitive development research in science and mathematics b: proceeding of an international seminar  aLeedsb: The University of Leeds, c1982  aix, 484p.   a17-21 September 1979
  aMathematics - Study and teaching a| Science - Study and teaching a| Scientific ideas