Okay, here is the reference you are requesting.
Rural carriers, find what you need fast!
knowledgebase.ruralinfo.net
However, please take note that this is for DPS letter mail only and NOT the trays of raw letters that I have seen many on here confuse with DPS. Many think just because they received a ton of raw letters that they are to be paid for said raw letters. Clearly NOT the case. ( pun intended ) The compensation for DPS , whether POV or Govt. vehicle, is ONLY for DPS letter mail that is severely out of order ; tray was dropped, every second or third letter is mis-sequenced, etc. When you receive all that raw mail, your only remedy is to request a DPS quantity review which is what every single carrier in the nation needs to as well as should do after every single count, route adjustment, or if they even THINK they see one more raw letter then the route should receive.