Sounds like it's meant as a living document (they reference github, and it's available here: https://github.com/basecamp/handbook/blob/master/README.md ), so doubtful. You could always clone the repo and "print" them to PDF though, and there's a bunch of results for a quick search of "markdown to PDF" if you want a batch/automatic tool. Actually, it'd be kinda cool to have a PDF version that gets automatically "compiled" every time the repo updates...