'In Beaver World' by Enos A. Mills is the result of beaver studies. It covers a period of twenty-seven years and teaches a lesson to workaholic humans. The book says everything about the beaver who enjoys a long summer vacation after working only less than half the time every year. There were a hundred million beavers at the beginning of the seventeenth century in North America. The reader will discover how civilized and helpful this creature is.
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