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asteroids -- collisions with earth.
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View The threat and the opportunity of asteroids and other near-earth objects By United States,United States. Congress. House. Committee on Science. Subcommittee on Space and Aeronautics. 
The threat and the opportunity of asteroids and other near-earth objects
By United States,United States. Congress. House. Committee on Science. Subcommittee on Space and Aeronautics.