The Houston Post. (Houston, Tex.), Vol. 40, No. 45, Ed. 1 Monday, May 19, 1924 - Page 11 of 14 - The Portal to Texas History
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Characteristics, distribution, origin, and significance of opaline silica observed by the Spirit rover in Gusev crater, Mars - Ruff - 2011 - Journal of Geophysical Research: Planets - Wiley Online Library
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