How do you get the world at war zombie maps on black ops with a code ?

i know that you can get the world at war zombie maps with the hardened or prestige edition, but i was wondering if there is a code i can use. No one say put in the 3arcunlock in the terminal because that only unlocks five and dead ops arcade. Another thing, i have the normal black ops ps3.How do you get the world at war zombie maps on black ops with a code ?
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