Maryniak, G E.(1996). Resources of free space vs. flags and footprints on Mars. Space Policy, 12(2), 103-117. doi:10.1016/0265-9646(96)00009-4
MLA CitationMaryniak, Gregg E. "Resources of Free Space Vs. Flags and Footprints On Mars". Space Policy, 12.2 ( 1996 ): 103-117.
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