A computer program (MODFLOWP) for estimating parameters of a transient, threedimensional, groundwater flow model using nonlinear regression: U.S. Geological Survey Open-File Report 91484,358 p.-1 994, Five computer programs for testing weighted residuals and calculating linear confidence and prediction intervals on results from the groundwater parameter-estimation computer program MODFLOWP: U.S. Geological Survey Open-File Report 93481,81 p.

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