Tritium in groundwater in the Black Hills of South Dakota von Rahn, Perry H., Detwiler, Andrew G., Davis, Arden D.

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Interpolation of Horizontal Transmissivity Anisotropy from Head and Flowpath Observations von Rahn, Perry H, Opp, Roger L

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Karstic gypsum problems at wastewater stabilization sites in the Black Hills of South Dakota von Davis, Arden D., Rahn, Perry H.

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DISCUSSION OF "Hydrogeology of a Portion of the Sand Hills and Ogallala Aquifer, South Dakota and Nebraska," by Perry H. Rahn and Howard A. Paul, September-October 1975 issue, pp.... von Rahn, Perry H.

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DISCUSSION OF "Hydrogeology of a Portion of the Sand Hills and Ogallala Aquifer, South Dakota and Nebraska," by Perry H. Rahn and Howard A. Paul, September-October 1975 issue, pp.... von Rahn, Perry H.

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The Hydrogeology of an Induced Streambed Infiltration Area von Rahn, Perry H.

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A method to mitigate acid-mine drainage in the Shamokin area, Pennsylvania, U.S.A von Rahn, Perry H.

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Symblepharon Formation in Epidemic Keratoconjunctivitis von Hammer, Leonard H, Perry, Henry D, Donnenfeld, Eric D, Rahn, Elsa K

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Visually debilitating pterygium : surgical and contact lens treatment von SMITH, R. J, HALLAK, J, VOGEL, M, KANELLOPOULOS, A. J, PERRY, H. D, DONNENFELD, E. D, RAHN, E. K

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