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"The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity."
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"The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity."
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Personal Development
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"The Indians could not undertake any widespread cultivation of the plains not only because they lacked iron tools but also because they had no draft animals."
Animals

"Man could not stay there forever. He was bound to spread to new regions, partly because of his innate migratory tendency and partly because of Nature's stern urgency."
Nature

"Surprising as it may seem, this study indicates that similar conditions are best for all sorts of races."
Diversity

"Curiously enough man's body and his mind appear to differ in their climatic adaptations."
Body

"According to the now almost universally accepted theory, all the races of mankind had a common origin."
Mankind

"Thus the races, though alike in their physical response to climate, may possibly be different in their mental response because they have approached America by different paths."
Diversity

"Nevertheless most of the evergreen forests of the north must always remain the home of wild animals and trappers, a backward region in which it is easy for a great fur company to maintain a practical monopoly."
Home

"In America the most widespread type of forest is the evergreen coniferous woodland of the north."
Geography

"The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity."
Geology

"America is the last great goal of these migrations."
Goal
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