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DIBUTYL PHTHALATE and DI(2-ETHYLHEXYL) PHTHALATE: METHOD 5020, Issue 2, dated 15 August 1992 - Page 4 of 4
Ardith A. Grote, NIOSH/DPSE; S33 and S40 originally validated under NIOSH
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/92
