How many volumes are in the watchmen graphic novel series?

Question

How many volumes are in the watchmen graphic novel series?

Answer 1

There are twelve comics that are still being sold on ebay but are very expensive. There's a book that has all twelve which is $20.  

Answer 2

There are twelve individual comics that tell the story.  In the graphic novel, all twelve are compiled into one.

Answer 3

Only the one which collects the original twelve issue series .

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