File:Report on the Geological survey of the state of Iowa - embracing the results of investigations made during portions of the years 1855, 56 & 57 (IA reportongeologic12iowarich).pdf
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![File:Report on the Geological survey of the state of Iowa - embracing the results of investigations made during portions of the years 1855, 56 & 57 (IA reportongeologic12iowarich).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/5/57/Report_on_the_Geological_survey_of_the_state_of_Iowa_-_embracing_the_results_of_investigations_made_during_portions_of_the_years_1855%2C_56_%26_57_%28IA_reportongeologic12iowarich%29.pdf/page1-391px-thumbnail.pdf.jpg?20201118061129)
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