00270nam a2200097Ia 4500008004100000082002000041100001600061245006800077260001100145650001600156220204s9999    xx            000 0 und d  a631.8(036)bDEG  aDEGEUS, J G 0aFertilizer guide for food graiins in the tropics and subtropics  aZurich  aFertilizers