Having borrowed it from the library, I've just finished Robert Zubrin's 1996 book: The Case for Mars: The Plan to Settle the Red Planet and Why We Must.
It's an interesting read.
Zubrin, rightly appalled by the likely 450G$ pricetag of any Mars' mission which followed NASA's 1989
90-day study, realised that there had to be a cheaper way to get
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