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    <subfield code="a">Nakhorn Luang Aquifor which is one of the eight aquifers under the Metropolitan Bangkok,  Thailand, and vitally important because it probably supplies more fresh water than any other of them is the case studied&#xB7; in this thesis. Among others, this study involves about the analysis of the water level data during the observation periods of 1968-1969, 1973-1974 and  late 1974 of the mentioned aquifer by numerical methods using the finite difference approximations of the basic differential equations that analogically represents. groundwater flow, along with a simplifying assumption. As a result, the transmissibility distribution of the aquifer and  the total outflow rate during the said periods are defined.</subfield>
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