1930. United States. Bureau of Public Roads. 1 map in 8 sections Scale 1:250,000. Approximately 1 inch to 4 miles Modified polyconic projection W 96°37′--W 90°07′/N 43°30′--N 40°07′. The Bureau.
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1930. Bushnell, T. M. (Thomas Mark),1889-1976,surveyor., Hendrickson, B. H. (Bertram Higbie),1892-surveyor, Kunkel, D. R. (David Roy),1901-surveyor., and Ulrich, H. P. (Herbert Paul),1904-surveyor. Shows soil types classification by colors and symbols. 'Field Operations, Bureau of Chemistry and Soils, 1930.' 'Lith Eastern Offset Inc., Balto.' ... The Bureau.
1930. Buckhannan, W. H.(William Henry), 1901-cartographer. Shows soil types classification by colors and symbols.; Field Operations, Bureau of Chemistry and Soils.; Lith. A. Hoen & co., Inc. Scale 1:63,360.... The Bureau.
1930. United States. Bureau of Public Roads. 1 map on 2 sheets. The Bureau.
1930. United States. Bureau of Public Roads. 1 map on 2 sheets. The Bureau.