Implementing rules and regulations (IRR) on chapter VII (Industrial Hygiene) of the sanitation code of the Philippines, P.D. 856 amending administrative order no. 111 s. 1991 

 - Manila :  DOH,  [1999] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Occupational Health -- legislation and jurisprudence
<br/><br/><label>Subjects--Index Terms: </label>Industrial Health Industrial Hygiene Occupational Safety IRR