Adul Phuk-in. (2022) THE EVALUATION OF DRILLING PERFORMANCE OF NAM PHI DRILL BIT. <i>Life Sciences and Environment Journal</i>, <i>23</i>(1), 219-234.Adul Phuk-in. "THE EVALUATION OF DRILLING PERFORMANCE OF NAM PHI DRILL BIT". Life Sciences and Environment Journal 23 (2022):219-234.Adul Phuk-in. THE EVALUATION OF DRILLING PERFORMANCE OF NAM PHI DRILL BIT. Pibulsongkram Rajabhat University:ม.ป.ท. 2022.