Here’s the latest draft, which covers Parts 1 and 2, as a 1-to-a-page PDF or as a 2-to-a-page PDF. (The latter is better for printing and mimicking the feel of holding an actual book.)

Comments welcome on the wiki or via email, etc! Note that Chapters 1-7 are close to being locked-in except for text changes, but of course we’re always happy to correct errors and consider alternatives; Chapters 8-11 are in much rougher shape and have greater potential for structural change.