因地制宜发展永定河沙泛区林果业&对廊坊市中部四县（区）林果业发展情况的调研报告
Develop the Forestry and Fruit Industry of Sand Strip along Yongding River to suit the Local Condition & Investigation Record to the Development of the Forestry and Fruit Industry of the Four Counties in the Middle Region of Lanfang City
永定河泛区