Philately - Air Mail (12)
Philately - Besieged locale (9)
Philately - Censored Mail (1)
Philately - Cinderella franked mail (1)
Philately - Earliest/Latest, First/Last & Proving dates or places (18)
Philately - Military Post Offices or Military Administration (2)
Philately - Multiple Postal Authority/Period mail (6)
Philately - Original Postal Document (2)
Philately - Postal Stationary (2)
Philately - Printed Matter mail (2)
Philately - Significant Addresses/Persons (2)
Philately - significant cachets & postal markings (27)
Philately - Significant franks on covers (12)
Philately - Significant Rates/Periods (4)
Philately - Significant Route (13)
Philately - Small Locales (3)
Philately - Stampless Mail (2)
Philately - Surface Mail (contemporary) (3)
Philately - Suspended Service mail (9)
Philately - Taxed Mail (4)
Philately - uncatalogued/undocumented varieties (2)
Philately - Unusual Origin, Destination or Postal Link (3)
Philately - unusual postal procedures/fines/taxes (7)
Unique/Discovery Piece (4)