Application of fertilizer nitrogen to nonfarm land in the United States Pacific Northwest for 2002

This spatial data set was created by the U.S. Geological Survey (USGS) to represent the amount of fertilizer nitrogen that was applied to nonfarm land in the Pacific...本空间数据集由美国地质调查局（U.S. Geological Survey, USGS）编制，用于表征太平洋区域非农用地的肥料氮施用量……