https://pe.usps.com/archive/html/dmmarchive20100607/601.htm
DMM 601 Mailability
dmm
https://pe.usps.com/text/pub52/pub52c3_020.htm
34 Mailability by Hazard Class | Postal Explorer
hazardclasspostalexplorer
https://pe.usps.com/text/imm/immc1_010.htm
130 Mailability | Postal Explorer
postalexplorer
https://pe.usps.com/IMM_Archive/NHTML/IMM_Archive_20250407/immc1_010.htm
130 Mailability | Postal Explorer
postalexplorer