"Preliminary Map Showing Present State of Knowledge relating to Underground Waters in the Central Great Plains [together with] Preliminary Geologic Map of the Central Great Plains", U.S. Geographical Survey

These attractive maps of western Nebraska and parts of bordering states show considerable detail. Topography and hydrography are well developed. Several railway lines are identified. Eighteen types of geological formations indicated by color are included on the geological map. The underground waters map indicates nine formation types plus the various depths of sandstone. Drawn by N.H. Darton. Both are approximately 30 x 30".

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Condition: A+

Bright and near mint examples.