POSTAL SERVICE (
A primary category containing information pertaining to
postal affairs such as controlled circulation of publications; rates and fees;
penalty; franked and official mail; free mail for the blind; collections;
deliveries; commemorative stamps and special services.
Subject
categories and sub-categories fully available for research are bolded. Closed categories and
sub-categories have a simple phrase describing their contents.
DESCRIPTION
OF SECONDARY FILE CODES
File
Code Description