Thinking about it i'm pretty sure Herbert himself designed some of the early embossed covers as he was a designer before becoming a novelist, although i may have made this up, i read a book on him a few years ago.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.