na INLIS000000000002235 0010-0121000601 West Pasaman irrigation project drafting and design standars S. Jaehn [s.i] German Agency for Techical Cooperation 1979 34 p. ill ; 29 cm 631.67 631.67 IRRIGATION-WEST SUMATERA WEST SUMATERA SUMATERA BARAT IRIGASI IRIGASI-PASAMAN BARAT PASAMAN BARAT. 3298 3298