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The actual document's title is: COMPTES RENDUS DES SÉANCES DE LA TREIZIÈME CONFERENCE GENERALE DES POIDS ET Officially the 13th Conference took place over both years. The actual paper's publication date is actually in May 1969. That's why they cite it as: Comptes Rendus de la 13e CGPM (1967/68), 1969, p.105 on

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