laporan penelitian text s.l] Universitas Mulawarman 1990 ii, 34 p. : ill ; 30 cm RIVERS SUNGAI WATER QUALITY IRRIGATION IRIGASI 627.16 627.16 INLIS000000000002761 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)