000 00275nam a2200121Ia 4500
100 _aPhoon, W O
020 _a9971-973-96-0
942 _cBK
245 _aPractical occupational health
260 _aP G Publishing, Singapore
_c1988
082 _a614.073 Pho
300 _ax,429
999 _c62881
_d62881