The bot­tom of each page has nav­i­ga­tional links for the pre­vi­ous page, next page, top page, and chap­ter in­dex (where applicable).

Fur­ther­more, you can:
• click the right edge for the next page.
• click the left edge for the pre­vi­ous page.
• click the top edge for the first page of the cur­rent chap­ter.
• click the up­per-left cor­ner for the ta­ble of contents.

Roll over the page edges to see these click­able areas.

Cross-ref­er­ences, de­noted with small caps, are clickable.

Links to out­side ma­te­r­ial are de­noted with a red cir­cle, like so.