It was originally published in Whispers Magazine Volume 5, Number 1-2, Whole Number 17-18, August 1982. This is Whispers Press Stephen King issue, with pretty much everything inside pertaining to King, along with some short stories by other writers. It came in three editions-a hardback that was signed (250 copies?), an unsigned hardback (which I own and may be just a publishers over-run?) and an unsigned trade paperback. They occasionally show up on the secondary markets like Ebay, etc. Well worth searching out as it has the complete text that King excised from the book. You can also get the
abridged version that was re-printed in TV Guide at a good price. It has some great Bernie Wrightson illustrations too. But, it's not the complete text. There's some great little backstory vignettes in it, so if I were you I'd track it down. The Whispers edition also has an ad for the Grant edition of The Gunslinger and also a review by the editor Stuart David Schiff, in which he states Do not miss this book.' Who knew?
Also an ad for Different Seasons and Fear Itself:The Horror Literature Of Stephen King. It also has the original short story It Grows On You by King. Articles include On The Shining And Other Perpetrations by King, Return Of The Son Of Mr. King: Book Two by David Schow and various artists with their takes on King's stories.