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47 Cigarettes, Smokeless Tobacco, and Electronic Nicotine Delivery Systems| pe.usps.com
43 Firearms| pe.usps.com
349 Class 9 Hazardous Materials| pe.usps.com
343 Flammable and Combustible Liquids | pe.usps.com
342 Gases (Hazard Class 2)| pe.usps.com
USPS Packaging Instruction 3B| pe.usps.com
453 Controlled Substances and Drugs| pe.usps.com