联邦主义的理路与困境：以美国为例：a case study of the United States 水环境保护政策与管理：以美国为例：a case study of the united states 能源地缘政治理论与实践：以美国为例：a case study of United States a case study of the united states a case study of the United States handbook for the study of the united states graduate study in the united states Handbook for the study of the United States a case study of United States a history of the united states