1:100,000-scale Digital Line Graph for Iowa
http://edcsgs9.cr.usgs.gov/glis/hyper/guide/100kdlgfig/states/IA.html
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By GISuser
1:100,000-scale Digital Line Graph for Iowa
http://edcsgs9.cr.usgs.gov/glis/hyper/guide/100kdlgfig/states/IA.html