Kochakorn Yooyen. 1997. Impact study of air pollution from rock industry to the lung functions of the 6th grade students case study : primary schools in Saraburi province, Thailand. Faculty of Graduate Studies, Mahidol University;

Kochakorn Yooyen. Impact study of air pollution from rock industry to the lung functions of the 6th grade students case study : primary schools in Saraburi province, Thailand. . Bangkok:Mahidol University, 1997.

Kochakorn Yooyen. (1997) Impact study of air pollution from rock industry to the lung functions of the 6th grade students case study : primary schools in Saraburi province, Thailand . Mahidol University/Bangkok.