I don't recall precisely (nor do I feel like digging through my books right now!!) but the forewords should tell you what changes were made and there significance. If memory serves, any recent changes will be so minor as to not even be noticed by most readers. I don't think you'll be missing anything substantial with any edition, as long as they have the appendices. fwiw
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History shows again and again
How nature points up the folly of men
Go, go, Godzilla!
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