- Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
- Corrected a few palpable typos.
- Re-arranged text in captions closer to the corresponding image.
- Expanded ambiguous references to illustrations, e.g. “Figure D” to “Figure 16D”
- Added one section heading, “The First Big Lake” to match the table of contents.
- Included a transcription of the text within some images, with estimated scale readings from charts.
- In the text versions only, text in italics is delimited by _underscores_.
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