In petition P-1619, the Chlorine Institute requested that updates to publications currently listed in § 171.7(l)—specifically § 171.7(l)(1), (2), (5), and (12)—and referenced in various sections of the HMR be incorporated by reference. PHMSA conducted a review of these publications and found them suitable to propose incorporation into the HMR. In the NPRM, PHMSA proposed to include the following updated documents in the referenced material: