PPD
| Date | Clue |
|---|---|
| 2014-11-12 | Mail order abbr. |
| 2003-09-28 | One way to send merchandise: Abbr. |
| 2001-01-23 | Mail order abbr. |
| 1998-07-15 | How most goods must be ordered by mail: Abbr. |
| 1997-06-21 | Mail-order abbr. |
| 1997-01-11 | Shipment notation: Abbr. |
| 1994-08-25 | Shipping letters |
| 1994-05-15 | Mail-order abbr. |
| 1994-03-14 | Abbr. in a mail-order ad |