Posted By:
Frank WakefieldFrom my copy of The American Card Catalog, 1960.
on page 42...
"Section 5"
"19th century U.S. Tobacco Insert Cards"
then follows a list of N cards
and on page 59...
"Section 6"
"20th century U.S. Tobacco Insert Cards"
then follows a list of T cards
Seems OBVIOUS to me that N is for nineteenth century tobacco, and T is for twentieth century tobacco.
Frank W.