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![Cover image for Report on the Geological Survey of Iowa. By J. Hall, J. D. Whitney. [With maps.] vol. 1.](https://thumbs.readings.com.au/-ysv9dFttmARdEf3cwczY1Y1zX8=/0x500/https://readings-v4-production.s3.amazonaws.com/assets/f95/1db/979/f951db979f39f4e2ab1c563c14266b82f38452ba/978124091856020210514-4-10fbetx.jpg)
