a route, usually numbered, traveled by a <#rfd=Rural Free Delivery> carrier from the parent post office.

see <#bear=Bear Stamps>.

hidden images on <#stamp=stamps> that can be viewed through a special lens available from the <#usps=USPS>.

<#revenue=revenue stamps> issued in 1871 (<#scott=Scott> R103-133) printed by <#carpenterjosr-gen=Jos. R. Carpenter> on paper with <#silkpaper-gen=silk fibers>.

see <#margin>