> MIT P is about to print the second edition of How to Design Programs and it is supposed to appear later this spring. We have therefore moved the on-line edition of HtDP/2e to htdp.org <http://htdp.org/>, and I encourage you all to quickly check the new web site. The first edition is still reachable through
this site too.

> Having said this, when we pull the plug on my personal HtDP/2e site, we will also launch the effort to rewrite the second edition into a third one. Once again we have permission from our MIT P editor, Marie Lufkin Lee, to host the new draft on line.

https://www.mail-archive.com/racket-users@googlegroups.com/msg37038.html