00316nam a2200157Ia 4500008004100000020000900041035001000050082001400060100001400074245003400088250000600122260000900128300000900137500000600146650000600152210723s9999||||xx |||||||||||||| ||und|| aNULL a23436 aNULLBSYK aSykes, P. 0aGuide To Mechanism in Organic a- a-b- aNULL a0 a-