1930. Tester, Allen C. (Allen Crawford), 1897-. 1 color map Scale 1:500,000. W 96°37′--W 90°07′/N 43°30′--N 40°07′. Iowa Geological Survey.
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1886. University of Iowa. Libraries. Map Collection and Warner & Foote. Image from Warner & Foote's 1886 Plat book of Allamakee County, Iowa showing a geological map of Allamakee County. Warner & Foote.
1892. North West Publishing Co.
1870. Gray, Ormando Willis. 1 map. Stedman & Brown & Lyon.
1895. North West Publishing Co.
1900. Huebinger Survey and Map Publishing Co.
1892. North West Publishing Co.
2158. Greater Oskaloosa, Iowa
1904. Huebinger, M. (Melchior). Iowa Publishing Co.
1930. Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs... United States. Department of Agriculture and United States. Agricultural Stabilization and Conservation Service.
1950. Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs... United States. Department of Agriculture. Production and Marketing Administration.