More on Black Thursday from Infoplease:

• Black Thursday - Black Thursday February 6th, 1851; so called in the colony of Victoria, from a terrible bush-fire ...
• Dictionary of Phrase and Fable: B - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "B"
• CDA - CDA: /C·D·A/ The “Communications Decency Act”, passed as section 502 of a ...