00310nam a2200109Ia 4500008004100000082002300041245004800064260003900112300001500151600002300166650001100189130903s9999    xx            000 0 und d  a633.91:338.004  K2  aRubber; botany, production and utilization.  aLondonbLeonard Hill (Books)c1962  axvii,449p.  aPolhamus, Loren G.  aRubber