- - Contents of some envelopes: Abbr
- - Contents of many files: Abbr.
- - PO Box contents
- - POB contents
- - Env. contents
- - They're written and inserted into envelopes, for short
- - Items in a post box, for short
- - Post office box items: Abbr.
- - Env. items
- - Liquid measuring units, for short
- - Unit to measure liquid quantities: Abbr.
- - Much mail: Abbr.
- - PO box items, for short
- - Office corr., sometimes
- - Serious dating, in personal ads
- - Post office deliveries that might have "forever" stamps on them: Abbr.
- - P.O. deliveries
- - Predecessors of much email: Abbr
- - P.O. box fillers
- - Acronym parts: Abbr
- - USPS items
- - Some paperwork: Abbr
- - USPS pieces
- - Fillers of envs
- - A and P, e.g.: Abbr
- - Brief missives?
- - Env. inserts
- - P.O. stack
- - Monogram units: Abbr.
- - P.O. box inserts
- - U.S.P.S. deliveries
- - Posted pieces: Abbr.
- - 34-Across concerns
- - P.O. pile
- - A, B and C, briefly
- - A, B, and C (abbr.)
- - USPS cargo (abbr.)
- - What P.O.'s handle
- - P.O. sackful
- - P.O. items
- - Wd. components
- - P and L, e.g.: Abbr.
- - PO items
- - P.O. pieces
- - Posts: Abbr.
- - Items in mailboxes: Abbr.
- - P.O. box filler
- - Wd. parts
- - Items in a P.O. box
- - Alphabet components: Abbr.
- - U.S.P.S. cargo: Abbr.
- - PO boxful
- - P.O. box items
- - P.O. box stuffers
- - PO Box fillers
- - This puz. has 373
- - Crossword fillers (abbr.)
- - Corp. communications
- - Alphabet: Abbr.
- - Athletic rewards: Abbr.
- - Harbor ships: Abbr.
- - A, b, etc.: Abbr.
- - There are 185 in this puzzle: Abbr.
- - Crossword fodder: Abbr.
- - USPS deliveries
- - P.O. boxful
- - Monogram components: Abbr
- - Monogram pts.
- - G.P.O. items
- - Mail abbr.
- - USPS delivery
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