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Driftless Area, poor farming practices reducing native brook trout numbers, settlement in mid-1800s although improvements were made soon after, The Driftless Area hurt by settlement in mid-1800s, The Driftless Area is of concern as it holds many rare species, row-cropping as the greatest freshwater polluter, The Driftless Area conserved by additional conservation groups, landscape of limetone bluffs, The Driftless Area consists of NE Iowa, DNR counting upon the federal farm bill, The Driftless Area conserved by some landowners