McCarthy et al.: LISP 1.5 Programmer's Manual

This one I have been wanting to read for ages. When I finally bought it this summer, I was not so intrigued, though. But that came when code for a Lisp interpreter began to pour out of my brain in fall (see http://hic-sunt-lambdas.de/), and the vacation in November was perfect for reading this book.

It takes a bit of getting into it, because the terminology is different from the later established one in some parts. But then there is all that which is so familiar to anyone who loves Lisp. And much more about implementation details than I had hoped for. Not that any of those is really applicable to my own implementation, though, but it has gives me some ideas that I might like to follow.