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• Preface
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• Early Observers of Mars
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• Mr. Lowell's Discoveries and Theories
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• The Climate and Physiography of Mars
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• Is Animal Life Possible on Mars?
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• Temperature on Mars - Mr. Lowell's Estimate
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• A New Estimate of the Temperature on Mars
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• A Suggestion as to the "Canals" of Mars
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• Page Summary and Conclusion
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