The one where they sold bicycles on Mars. And Flatcats, the Tribbles of their day.

ADDED: They had a bit about asteroid mining there too, but it dates very badly. Back then the accepted theory was that the Belt was the remains of a planet.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort