Click on the links below the description of the presentation to open the video or the pdf of the slides.
Information on Botswana Official Free Marks in the video Stamps … Who Needs Them? Lessons Learned on the Development of Typologies and Cataloguing, Collecting the Non-Stamped Postal History of Botswana. (Sep 2019) A presentation at Milcopex 2019.
Video of the presentation, starting at 11:27
Slide Deck, slides 14 to 18