Implementing rules and regulations of chapter VII : industrial hygiene of the sanitation code of the Philippines amending administrative order no. 111 s. 1991 / Department of Health - Manila : DOH, 1991. - 99 pages : 23 cm. Subjects--Topical Terms: Sanitation code.Public health LC Class. No.: RA 601 D46 1991 COM / D-0138-COM