Abbr. on a pill bottle, 3 letters
Drug-standards publication: Abbr., 3 letters
Drug-stds. publication, 3 letters
FDA regulated pharmaceutical guide bk., 3 letters
Pill-bottle letters, 3 letters
32-center center: abbr., 4 letters
Letter-carriers' base: abbr., 4 letters
Letter-drop site: abbr., 4 letters
Mailing station (abbr.), 4 letters
Place to pick up pkgs., 4 letters
e.e. cummings, e.g., 6 letters
Nemerov and Strand, e.g., 15 letters
State Dept. concern, 8 letters
It increased to 4 cents per oz. in 1958, 9 letters
They're not empty-handed, 15 letters
They're hidden in this puzzle's seven longest answers, 12 letters
Fly Like an Eagle org., 4 letters
We deliver for you sloganeer: Abbr., 4 letters
Agcy. that delivers, 4 letters
Agcy. with an eagle logo, 4 letters
Census form deliverer: Abbr., 4 letters
Co. interested in zip codes, 4 letters
Daily delivery org., 4 letters
Deliverer of many pkgs., 4 letters
Deliverer to MA and PA, 4 letters
Door-to-door service (abbr.), 4 letters
Govt. group with an eagle as its logo, 4 letters
Gp. delivering letters, 4 letters
Gp. putting letters in boxes, 4 letters
Inits. on a mail truck, 4 letters
Its symbol is an eagle: Abbr., 4 letters
Letter carrier's org., 4 letters
Letter carriers' gp., 4 letters
Mail carrier's grp., 4 letters
Mail carriers' org., 4 letters
Mail deliverer: Abbr., 4 letters
Mail delivery imprint, 4 letters
One way to send pkgs., 4 letters
Org. that delivers the goods, 4 letters
Org. that trademarked Pony Express in 2006, 4 letters
Org. whose workers are left carrying the bag, 4 letters
Package delivery org., 4 letters
Postmaster General's org., 4 letters
Priority Mail agcy., 4 letters
Snail-mail system (Abbr.), 4 letters
Stamp maker in the US, 4 letters
The snail-mail co. in Computerese, 4 letters
They make deliveries, briefly, 4 letters
They used Steve Miller's Fly Like an Eagle in TV ads: abbr., 4 letters