- Silently corrected a few typos.
- Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
- In the text versions only, text in italics is delimited by _underscores_.
- Changed some input instructions to better fit radiobutton or checkbox functionality.
- In the HTML version only, data entry is supported, but input is not preserved across browser refreshes; it can be recorded by printing the file or saving the viewer screen.
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