00468nam a2200181Ia 4500 220204s9999 xx 000 0 und d 575:631.52 SIM SIMMONDS, N W Principles of crop improvement London Longman 1979 Crop improvement Genetic conservation In vitro methods Induced mutation Plant breeding Polyploidy BK 33313 33313 0 0 0 0 MAIN MAIN 2021-12-16 0 575:631.52 SIM 13812 2021-12-16 00:00:00 2022-02-14 BK