Application of nitrogen generated by grazing cattle to range 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 nitrogen generated by grazing cattle that was applied to range land...本空间数据集由美国地质调查局（U.S. Geological Survey, USGS）编制，旨在表征放牧牛只所产生并施用于牧地的氮素总量……