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ABSTRACT
The transient pressure transducer technique was used to test for threshold gradients in 9, 30, 40, and 50 weight percent montmorillonite and <2µ and 2–20µ size fraction kaolinite. Threshold gradients were not found in any of the samples tested.
Contribution from the Department of Agronomy, University of Illinois, Urbana 61801. The work upon which this publication is based was supported in part by funds provided by the United States Department of Interior as authorized under the Water Resources Act of 1964, Public Law 88-379.
Received for publication September 6, 1968. Accepted for publication November 6, 1968.
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