- Silently corrected a handful of palpable typos.
- Moved footnotes to a section immediately preceding the Index, and added an entry for it to the Contents.
- Slightly reformatted tables to better fit dynamic flow on narrow screens.
- Conjecturally restored one missing subtopic (“Coal, importance of”) in the Index.
- In the text versions, delimited text in italics by _underscores_.
- In the text versions, included filenames of illustrations, for more convenient reference (by another program).
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