Metode pengukuran bathimetri menggunakan alat perum gema
Indonesia. Badan Standardisasi NasionalUnknown
Badan Standardisasi Nasional (Jakarta, [1993]) (ind) IndonesianUnknownStandar Nasional IndonesiaUnknownDEPTH-AREA-DURATION (HYDROMETEOROLOGY)-MEASUREMENT; Appendix: p. 9 - 17; Box 9/107; Unknown