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Drainage design factors : 28 questions and answers ; based on the expert consultation on drainage design factors, Rome, 22 - 29 october 1979
Dieleman, P. J., (1980)
Methods and machines for tile and other tube drainage
Theobald, G. H., (1963)
Socio-economic impact of fourth flood control and drainage project
Ghafur, Abdul, (1996)