00318nam a2200109Ia 450000500170000000800410001708200150005810000180007324500620009126000470015330000080020020260225050955.0260224s9999||||xx |||||||||||||| ||und||  a631.72 SID  aI.H. Siddiqui 0aIrrigation canals: Planning, design, constrution and ….  aIslamabad: National Book Foundation c1979  a441