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  • Advances in Display and Analysis of Groundwater Data

    physical model in which vertical rods extend from a map to show groundwater level changes in the Joliet, Illinois, area

    This model was constructed to show the change of groundwater levels in the Joliet, Illinois, area. Tops of rods represent ground level, the bottom of the black portion the former water level, and bottom of the light gray portion the present water level.

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