1930. Iowa. Department of Transportation. color map.
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1930. Iowa. Department of Transportation. color map.
1930. Iowa. Department of Transportation. color map.
1930. Iowa. Department of Transportation. color map.
1930. Iowa. Department of Transportation. color maps.
1940. Iowa. Department of Transportation. color maps.
1940. Iowa. Department of Transportation. color maps.
1940. Iowa. Department of Transportation. color maps.
1940. Iowa. Department of Transportation. color maps.
1940. Iowa. Department of Transportation. color maps.