00329nam a2200109Ia 4500082002500000100001900025245012300044260002700167300001500194500000500209700000500214  a338.176349bAs848.PF  aAssmann, Ernst  aPrinciples of forest yield study; studies in the organic production, structure, increment and yield of forest standsb  aOxfordbPergamonc1970  axiv, 506p.  a  a