This polygon shapefile represents refining districts in the United States. This layer is from Winter Quarter 2016. This layer is intended to assist users in locating and analyzing oil refining district data in the United States and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. Hart Energy Publishing.(2016). Refining Districts, United States, Winter Quarter 2016. Hart Energy Publishing. Available at: http://purl.stanford.edu/pb374ks2614 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.