is your book a combination of Brave New World and Brave New World Revisited? I know year later Huxley wrote some additional short stories based on Brave New World. I've got them as a separate book. it's rather short so it's possible it's included in the edition you have.
I have Brave New World unabridged and unadaptedfrom the original text and with seventeen related readings.
Technically it is only 14 other short stories/articles and then 3 lists of articles for related books, webpages and movies.
One of the 14 is BNW Revisited by Huxley.