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Plus, it's probably also like why isn't Airport '75 out on Blu-Ray?
Because the people who own the publishing rights don't think it will make them enough money to be worth it. While both were insanely popular for a while, that actually kind of hurts, because used book copies are a dime a dozen (almost probably literally).
And since the original author is dead, there's likely no one really pushing for it on that end.
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