Presentaties:
- Paper Fluorescence on US Stamps – Hans van Gils 11 oktober 2020
- U.S. Modern Luminescent Ink Stamp Varieties – Mark Stockburger 4 januari 2022
- Luminescent ink on US Stamps – Hans van Gils 20 mei 2020
- Tagging Varieties U.S. Postage Stamps – Hans van Gils 18 mei 2019
Checklists:
- Paper Fluorescence on US Stamps – update 5 november 2020
- Luminescent ink on US Stamps – volgt
- Tagging Varieties U.S. Postage Stamps – update 4 oktober 2020