real boxes
Letter Box Montage Card (1984)
The Post Office in Miniature (1989)
Letter Boxes: Trollope Kensal Green Cemetery (2007)
Letter Box Bibliography 1 (2008)
Uruguayan Penfold Boxes Discovered (2009)
Carronade (2009)
Letter Boxes on Bank Notes (2009)
Hungarian Letter Boxes (2009)
Letter Box Bibliography 2 (2009)
A Letter Box Matchbox Label (2009)
Prepaid Cards Depicting Letter Boxes (2009)
Private New Zealand Letter Boxes (2009)
Letter Boxes on Spanish National Lottery Tickets (2009)
On the Street Where You Live (2010)
Check on Liars Penfold Letter Box (2010)
Uruguayan Penfold Boxes: An Update (2010)
John Vaudin: Jersey's Man of Iron (2010)
Letter Box Bibliography 3 (2010)
Worldwide UPU Letter Box Statistics (2012)
Letter Box Bibliography 4 (2012)
A Letter Box Bibliography (2012)
Worldwide Letter Box Histories (2012)
Portuguese Penfold Letter Box Discovery (2014)

letter box stamp theme
Letter Boxes on Stamps and Postal Stationery: Version 1 (1984)
Letter Boxes on Stamps and Postal Stationery: Version 2 (1985)
Exhibiting Letter Boxes (1987)
Letter Boxes on Stamps and Postal Stationery: Version 3 (1991)
The Development of the Letter Box: A...
...Centenary Display by NPS at RPSL (1999)
Letter Boxes on Stamps: Part One (2001)
Letter Boxes on British Postmarks: Part 1 (2002)
Letter Boxes on British Postmarks: Part 2 (2002)
Letter Boxes and Stamps (2002)
The Letter Box Stamp Theme (2004)
Letter Boxes as a Theme (2006)
Letter Box Postal District Labels (2008)
An Post 25 (2009)
Australia: Postbox Stamps (2009)
Australia: Postbox Cancels and Labels (2009)
Anthony Trollope: Irish Stamp (2009)
Putting an Exhibit Together (2010)
Philately and the Letter Box Theme NL150 (2013)

Letter Box Study Group

Philately and the Letter Box Newsletter
Philately: Site Plan