The phrases "Tenth Anniversary World Science Fiction Convention" (TAWSFiC) and "Tenth Anniversary Science Fiction Convention" (TASFiC, likely a simple linotype error, as "World" is missing) were each used in some of this Worldcon's pre-convention materials; but the phrase's acronyms "TAWSFiC" and "TASFiC" were never used officially in print or otherwise by Chicago at that time.
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