na YOGYA-02090000067981 20090227092027.0 ind 010-020900000067981 614.8 614.8 Eld K ELDER, Mark Keamanan di air Mark Elder Cet. 1 Jakarta Sinar Harapan 1982 116 hlm ilus 21 cm Pengamanan di air YOPDYOG JSC 10-01-2009 1 b000038544