Lunar microfossil resembling a spiral filamentous microorganism, from O.D. Rode et al., D. Reidel Publishing Co., 1979.
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Microscopic impact craters from lunar samples, by Dirk Stoltenberg, Heidelberg Dust Group [PDF: 1.48Mb] (p 8, no scale).
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A 10-μm-diameter microcrater on lunar glass, from Donald E. Brownlee et al. [abstract], p 1767 v 304, Science, 18 June 2004.
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