McGuire, V.L., Seanor, R.C., Asquith, W.H., Kress, W.H., and Strauch, K.R., 2019, Potentiometric surface of the Mississippi River Valley alluvial aquifer, spring 2016: U.S. Geological Survey Scientific Investigations Map 3439, 14 p., 5 sheets, https://doi.org/10.3133/sim3439.
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https://doi.org/10.3133/sim3439
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McGuire, V.L., Seanor, R.C., Asquith, W.H., Nottmeier, A.M., Smith, D.C., Tollett, R.W., Kress, W.H., and Strauch, K.R., 2020, Altitude of the potentiometric surface in the Mississippi River Valley alluvial aquifer, spring 2018: U.S. Geological Survey Scientific Investigations Map 3453, 13 p., 5 sheets, http://dx.doi.org/10.3133/sim3453.
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https://doi.org/10.3133/sim3453
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McGuire, V.L., Seanor, R.C., Asquith, W.H., Strauch, K.R., Nottmeier, A.M., Thomas, J.C., Tollett, R.W., and Kress, W.H., 2021, Altitude of the potentiometric surface in the Mississippi River Valley alluvial aquifer, spring 2020: U.S. Geological Survey Scientific Investigations Map 3478, 5 sheets, includes 14-p. pamphlet, https://doi.org/10.3133/sim3478.
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https://doi.org/10.3133/sim3478
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