1850. J.H. Colton & Co. 1 color map 55 x 65 cm Scale approximately 1:887,040. J.H. Colton.
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1850. J.H. Colton & Co. 1 color map 54 x 65 cm, on sheet 65 x 76 cm, folded in cover (15 cm) Scale approximately 1:885,000. J.H. Colton.
3. Iowa, 1855
1850. J.H. Colton & Co. 1 map. J.H. Colton & Co.
4. Iowa, 1855
1850. J.H. Colton & Co. 1 map Scale [ca. 1:1,440,000] W 96°37′--W 90°07′/N 43°30′--N 40°22′. J.H. Colton & Co.
5. Iowa, 1858
1850. J.H. Colton & Co. 1 map. Johnson & Browning.