A mystery within a mystery, involving Tom Bombadil.

[Rinfanawen]

Well, while we're on the topic of where to find The Adventures of Tom Bombadil, I have a question. Is there more than one version of the poems? I own a copy of it that is called The Adventures of Tom Bombadil. It is said to contain 16 poems in it. My suspicion arose when Bombadil said:

Perhaps the answer lies in the poem of The Adventures of Tom Bombadil, but I do not own a copy - because I don't have 300 dollars to buy one!

My copy came in a book with, I think, 6 other things written by Tolkien, and my mom got it for me for about $40.00. Is this the real version, or is there another version out there that I don't know about? I would really like to know if I have the real thing or not.