"Listing of Electric Companies and Voltage Lines in the United States: 1950s Map Notations"1946-1975unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_001_9_0000_4_91The document is a detailed map showcasing the electrical grid system in various regions of the United States. It includes existing and proposed voltage lines, power dams, and electric companies such as Union Electric, Empire District Electric Company, and Arkansas Power & Light Company. The map also features power dams, electric systems, and service areas associated with different power entities. It shows the locations of cities, towns, and geographical features like rivers and mountains. The map is labeled with a legend for easy understanding.