Metode pengukuran tinggi muka air tanah bebas di sumur
Indonesia. Badan Standardisasi NasionalUnknown
Badan Standardisasi Nasional (Jakarta, [1995]) (ind) IndonesianUnknownStandar Nasional Indonesia (SNI)UnknownGROUNDWATER-TESTING-STANDARDS; Box 15/445; Unknown