Iowa. Department of Natural ResourcesIowa Geological SurveyProvides information about historic coal mines in Iowa including most recent available mine maps, mined areas or point locations, mine entrances, and mine names.https://programs.iowadnr.gov/geospatial/rest/services/Geology/CoalMines/MapServereng03a-01-001PublicHistorical Coal Mines [Iowa]Web servicesIowaLate 1880s through the 1990s