00428    a2200133   4500020001500000082001500015100001800030245007100048260005300119300002000172440003700192650002700229650003800256  a033336435X  a631.2bBAL  aBalls, R. C.   aHorticultural engineering technology fixed equipment and buildings  aLondonbMacmillan Publishing Companyc1986g1986  axii,246p.c22cm  aScience and horticulture series   aAgriculture structures  aApparatus , equipment , materials