188 pages hardcover "Book Club Edition". As can be seen below, it was released in a least 3 different Dust Jackets.
From my personal collection.
(Click on the pictures to review them in their native resolution.)
Dust Jacket Style C
To quote this article
Danny Duchesneau@2022, "Dawn of the Dead Hardcover Book Club Edition Novelization issued in the US by publisher St. Martin's Press in 1978", Dawn of the Dead Collector's Blog, published on 12 January 2022.