Benjawan Aransawan. (1993) An application of geographic information system on national park management : a case study of Khao Sam Roi Yod National Park, Prachuap Khiri Khan province. Mahidol University,:ม.ป.ท.Benjawan Aransawan. 1993. An application of geographic information system on national park management : a case study of Khao Sam Roi Yod National Park, Prachuap Khiri Khan province. ม.ป.ท.:Mahidol University,;Benjawan Aransawan. An application of geographic information system on national park management : a case study of Khao Sam Roi Yod National Park, Prachuap Khiri Khan province. ม.ป.ท.:Mahidol University, 1993. Print.