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VorpalBunny said:Hell, if you can't find a copy of CoC d20, pick up the BRP version. Delta Green is definitely worth it. If you're still convinced d20 is the only way to go, then a conversion from CoC d20 to d20 Modern shouldn't be too hard to do.
Chaosium has BRP Quick start rules free.
http://www.chaosium.com/forms/coc_quick_start_color.pdf