a rectangle of clear <#phostag=phosphor taggant ink> applied over a <#stamp>‘s <#design>, as opposed to taggant covering the entire stamp.

paper with 35% rag content (instead of all wood pulp) and a blue mineral colorant used to print certain <#poststamp=postage stamps> issued in 1909.  The resulting stamp papers have a pale bluish color.  Examples: <#scott=Scott> 357-366.

<#revenue=revenue stamp> used on applications for motorboats.  <#scott=Scott> RVB.

see <#amb=Ambulance bag>.

a unit of <#stamp=stamps>, sold by the post office, comprising one or more <#bp=booklet panes>.  Traditional booklets used cardboard covers stapled or glued together to protect the enclosed booklet panes.  With a few exceptions, traditional booklet panes used water-activated gum.  Contemporary booklets (both <#convbooklet=convertible booklets> and <#vendbooklet=vending booklets>) contain self-adhesive stamps and are sold as single panes.  Contemporary booklets do not have separate covers.  The backing paper serves as the cover.