Related Clues:

• Monogram (abbr.)
• The J. and K. in J. K. Rowling: Abbr.
• "I" and "M" in I.M. Pei (Abbr.)
• FDR, HST, etc.
• Office corr., sometimes
• Monogram: abbr.
• U.S.A. or U.K.
• JFK and LBJ, e.g
• 34-Across concerns
• J.F.K., e.g
• P.O. deliveries
• USPS pieces
• P.O. box inserts
• Contract change approvals: Abbr
• Personal ltrs