00302nam a2200121Ia 4500003000400000020001500004040000800019082001600027100001900043245006800062260003700130300001300167LDD  a0851987052  cLDD  a630.23 P943  aMatthews, John 0aProgress in agricultural physics and engineeringcJohn Matthews  aOxonbC.A.B.Inter Nationalc1991  aX, 337p.