As access to information should be open to everyone, it came to a logical conclusion that information about joint stamp issues stamps should also be made available for all and for free. Starting 2022, the Joint Stamp Issues Catalogue becomes available with free access simply by opening the different links (catalogue covers) below. Have a nice exploration.
For more information about the catalogue and its recent development, read more.
Introduction
Volume 1 – V3.04
Introduction – Definitions –
Folders – Joint coins – 110 pages
Latest Update: 20220801
This 1,700-pages catalogue contains presently (January 2022) over 2,100 entries describing sets of joint/common stamp issues among which more than 1,400 are true joint stamp issues (Unique, Se-tenant, Twin, Concerted or Parallel according to the official definition). More than 15,000 objects (stamps, souvenir sheets, miniature sheets, but also stationary, first day covers or folders) are described and illustrated with more than 7,800 pictures. Finally, more than 32,000 quotations are provided for these different items.
Joint Stamp Issues 
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