Management Employee ownership 3 Employee participation 3 Producer cooperatives 3 Economic conditions 2 Water-supply 2 Animal introduction 1 more ... Conservation of natural resources 1 Control 1 Cooperative societies 1 Discharge of ballast water 1 Economic aspects 1 Environmental aspects 1 Government policy 1 Irrigation 1 Marine pollution 1 Mathematical models 1 Motion picture theaters 1 Motion pictures 1 Nonindigenous aquatic pests 1 Politics and government 1 Prevention 1 Privatization 1 Religious aspects 1 Rice 1 Rites and ceremonies 1 Ships 1 Social aspects 1 Social conditions 1 Social life and customs 1 less ...