Mars: A World for Exploration (1959)

Our understanding of Mars has come a long way since we launched our first probe toward the planet in 1964. In 1959, at the dawn of the Space Age, Pluto discoverer Clyde Tombaugh summed up conditions on Mars for members of the American Rocket Society. Space historian David S. F. Portree takes stock of how far our knowledge has advanced -- and how much we have left to learn.

Source: http://www.wired.com/wiredscience/2012/05/mars-a-world-for-exploration-1959/

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