Keywords: Air pollution, Coal, Coal mining, Compost, Conservation, Crop rotation, Duck Stamp Act, Environment, Erosion, Farming, Groundwater, Iowa Federation of Women, Iowa Till Program, Land conservation, Land use, Landfill operation, Law, Legumes, Manufacturing, May McNider, Mill Creek Culture, Mineral resources, Minerals, National Wildlife Federation, Native Americans (American Indians), Natural resources, Parks, Pilot Knob, Pioneers, Pollution, Preservation, Reclamation, Sewage treatment, Synthetic fertilizers, Water pollution, Watershed, Women, Jay Norwood “Ding” Darling
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