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ISO 8878
http://www.standardzworld.com/iso-8878.htm
Definition, specification and resources to support ISO/IEC 8878:1992
ISO/IEC 8878:1992
http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=16385&ICS1=35&ICS2=10
Information technology -- Telecommunications and information exchange between systems -- Use of X.25 to provide the OSI Connection-mode Network Service - 2nd edition. Requires purchase.
ISO/IEC 8878:1992/ Cor.3:1996
http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=26240&ICS1=35&ICS2=10
Technical Corrigendum 3 - 1st edition. Requires purchase.