Williams, B. G. Inferring recharge/discharge areas from multifrequency electromagnetic induction measurements / by B. G. Williams and Somsri Aruni. - Canberra : CSIRO, 1990. - i, [15 p.] : ill. ISBN: 0643051260 LCCN: 91013170 Subjects--Topical Terms: Soils-Surveys--Thailand.Soils--Research--Methodology.Soils--Quality--Thailand.Soil-Surveys--Geophysical methods.Electromagnetic induction