I have a copy from 1978. It is my all time favourite book.
Why did I not know that it was released as an abridged version? I've just discovered that there are about 300 pages missing that are included in a version released in 1990. 
I feel like I've stepped into an alternate reality - how did I not know this?
Is there anything else I'm missing, any secret books that SK wrote that I've somehow not come across?