For occasional research, check your local library or a regional philatelic society

that are interactive and accessible via tablets or computers. Authorized Retailers: Sites like sell both new and outdated/discounted physical copies. www.mchip.net

If you need the most recent 2025 or 2026 editions, these typically require a purchase or subscription: Official Yvert & Tellier Store: The publisher offers Digital Editions

A comprehensive online database covering stamps from the 1920s to the present, often listing Yvert numbers for items currently on sale. Philatelie.fr

; they often maintain current subscriptions to these catalogues for member use. year range , or would you like to see how Yvert numbering compares to other systems like Scott or Michel?