Thailand, Covered. is built from the articles below — this site’s own reporting, written at the same desk, not an outside authority. Sentences in quotation marks in the book are verbatim from these pages, and reported figures (marked ◇ in the book) were passed on as they were reported here.
Where a claim rests on something other than this reporting — the road-risk figures in the Risk essay are US State Department data, for instance — the book names that source in the line itself.
Last checked means someone re-read the article against its sources on that date. Most pages carry only a publication date, and that is the honest state: it is not a claim that nothing has changed since.