<https://agdatacommons.nal.usda.gov/articles/dataset/Frontier_and_Remote_Area_Codes/25696389/1>
<http://schema.org/keywords>
"ZIP code, codes, maps, nonmetro, rural"
<https://agdatacommons.nal.usda.gov/articles/dataset/Frontier_and_Remote_Area_Codes/25696389>