Ian McQueen is a renowned philatelic author who specialized in these often-overlooked auxiliary markings. His book, "Jusqu'à Airmail Markings: A Study,"
, this book is indispensable. While it is a technical "study" rather than a narrative history, McQueen’s clear organization makes it accessible for anyone trying to understand the journey of a specific airmail cover. It remains the "gold standard" for this niche, often cited in auction catalogs and expertizing certificates. Jusqu-a Airmail Markings- A Study Ian McQueen
If you are fortunate enough to locate a copy of Jusqu’à Airmail Markings – A Study (original print runs were likely under 500 copies), or if you find a digital scan in a philatelic society library, here is how to use it: Ian McQueen is a renowned philatelic author who
Ian McQueen