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Syri J Koelfgen
Syri J Koelfgen is the author of "A Plasmoid Thruster for Space Propulsion".
Books by Syri J Koelfgen
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A Plasmoid Thrust...
Koelfgen, Syri J.
Paperback:
A Plasmoid Thrust...
Koelfgen, Syri J.
Paperback:
$14.75