أرسل هذا في رسالة قصيرة: DETERMINING OF PERMEABLE ZONE NEAR SURFACE THROUGH THE ANALYSIS OF GAS MERCURY, RADON AND THORON CONCENTRATION IN THE NORTH WAYANG-WINDU GEOTHERMAL FIELD

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/ //---`' | || | || / //---`'   \ ` //   | ' //  
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  `----`    `---`     `----`     `-`'    `-` --`