Shallow Water Table Fluctuations in Relation to Soil Penetration Resistance.Published in:Ground Water, 2003, v. 41, n. 7, p. 964, doi. 10.1111/j.1745-6584.2003.tb02438.xBy:Shanley, James B.;Hjerdt, K. Niclas;McDonnell, Jeffrey J.;Kendall, CarolPublication type:Article