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Appendixes
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Hexavalent Chromium . Chromium contained in naturally occurring geologic materials is primarily in the trivalent state (a +3 ion)
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NASA plans and requirements for validation of critical technologies in the actual Martian environment prior to committing to a program of human exploration. The review of critical technology validation will emphasize those technological issues that are directly relevant to managing environmental, chemical, and biological risks to humans operating on Mars.
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