This text has a Rule 6 copyright clearance. Research has indicated the
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The position of some illustrations has been changed to facilitate
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Footnotes are located at the end of each chapter.
In general, geographical references, spelling, hyphenation, and
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Minor typographical errors—usually periods, commas and hyphens—have
been corrected without note.
Significant typographical errors have been corrected and are marked with
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is also available in the [Transcriber's Corrections] section at the end of
the book.