| http://www.w3.org/ns/prov#value | - This book is a useful summary of the current state of planning and a welcome addition to our growing library of books on Mars. (Dave Shayler, Spaceflight, Vol. 46 (7), 2004) The book is devoted to a look back at the US???s Cold War-era NERVA nuclear rocket project and a look forward to a successor.
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