000			00410nam a2200157Ia 4500
003			NIELib
008			211019s9999||||xx |||||||||||||| ||und||
020			_a0356041050
082			_a507.07 _bRAD
100			_aRadford, Don _95594
245			_aChange stages 1 and 2 and background
260			_bMacdonald Educational, _c1973. _aLondon :
300			_a88p.; _bill.; _c22cm
650			_aScience
942			_2ddc _cSR
999			_c5963 _d5963