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Appendix A: Statement of Task
Pages 45-47

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From page 45...
... Appendixes
From page 46...
... Hexavalent Chromium . Chromium contained in naturally occurring geologic materials is primarily in the trivalent state (a +3 ion)
From page 47...
... 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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