- Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
- Corrected a few palpable typographical errors.
- The “List of Specimens” was not consistent with figure captions; there was no obvious fix, and none was attempted.
- Added one section heading, “3. Iroquois Weighted Drill” to make section headings (but not section order) consistent with the introductory classification.
- In the text versions only, text in italics is delimited by _underscores_.
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