Digital Monographs LIVE on the Greene Foundation Website

The Greene Foundation is pleased to announce that in addition to the print books we publish, we now publish digital monographs on Canadian philatelic subjects. These digital monographs are available under the “Resources” tab at the top of our website or follow this link.

If you would like to learn more about this initiative, please contact our Vice-President & Secretary Ingo Nessel at b62hkg@yahoo.ca.

We are launching with two free digital monographs by Marc Castel, read on to learn more, and download them here!

Newfoundland's Inverted Air Mail Surcharges: A Comprehensive Study of the Halifax, Do-X, and Balbo Issues (1921-1933)

by Marc Castel

This study presents a comprehensive history of Newfoundland's three pivotal inverted air mail surcharge errors: the 1921 Halifax Air Mail (C3a), the 1932 Dornier Do-X (C12a), and the 1933 General Balbo Flight (C18a). By drawing upon primary philatelic literature, historical documentation, postal records, and expert authentication reports, it examines the technical aspects of stamp and overprint production, the personnel and aircraft involved, flight and mail operations, error discovery and forensic analysis, and the economic and ethical implications of these remarkable artifacts.

Using AI in Philately: A Practical Guide

by Marc Castel

Artificial intelligence (AI) has moved from novelty to utility in philately. Tools that identify stamps from images, retrieve auction records, summarize research literature, draft exhibit text, and interrogate datasets are now accessible to ordinary collectors. This article surveys the principal applications and explains, in plain language, how large language models and machine learning systems work, and why their value depends on the quality of their training data.