1933 1945 20thcenturychinesehistory africa agricultural agriculturaleconomics agriculturalmanagement agriculturaltechnology agriculture alliances animals aquaculture asia asianstudies axis beverage biology biotechnology botany business canadianpublicpolicy china climaticagriculture cropmanagement crops cultural dissent eastasia ecology economicaspects economicaspectsofcommunism economicpoliciesineurope economics ecosystems environmentalaspectsofagriculture environmentallaw environmentalscience equipment ethnobotany ethnosciences europeanlaw europeantheater family famine finance fisheries food foodprocessingmachinery foreign foreignbusinessenterprises foreigntraderegulation gatt general genetics germanhistory germany government habitatsinenvironmentalscience hunger international internationallaw maritimelaw medicine mi miscell miscellaneous miscellaneouspoliticaltheory nationalsocialism naturaldisasters naturalhistory nutrition politicalaspects politicalprotest politics preventivemedicine publichealth radicalthought regional regionalplanning reproduction ruraldevelopment ruralsociology science social socioculturalaspects soilmanagementinagriculture soils sovietunion techniques technologicalinnovations tobaccoindustries transferance treaties unitedstates unitedstatesstudies vegetablegardening worldtradeorganization worldwarii