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"Money to me is freedom, and freedom is essential. Money allows me to say that I will now devote my life to being me, rather than putting on my shoes and tie, and going to an office every day."
- Robert Silverberg

Martian Canal Ice  
  Open water ice on the fourth planet.  

Canal ice was, of course, never cleaned of skate marks; the surface was renewed from time to time by midday thaws until the dead freeze of winter set in. However, it was unlikely that anyone but the two boys had skated over this stretch of ice, so far from any settlement, anytime in months. The ice held scooter tracks to be sure, but, like all skaters, Jim and Frank had avoided them in favor of untouched ice.
Technovelgy from Red Planet, by Robert Heinlein.
Published by Scribner in 1949
Additional resources -

Here's another reference to ice on Mars, from The Gears o Time (1953) by William Morris:

The ground looked normal, but it was incredibly slippery. Correll had walked on sheet ice on Mars, on ice so slippery that the slightest departure from the vertical was sure to lead to a loss of balance.

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Additional resources:
  More Ideas and Technology from Red Planet
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Red Planet
  Tech news articles related to works by Robert Heinlein

Martian Canal Ice-related news articles:
  - Skating On Mars' Frozen Pools

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