Common Lisp the Language is a book by GuySteele about CommonLisp. It pre-dates the ANSI Common Lisp specification (see the CommonLispHyperspec) but being in textbook style it’s much more useful for beginners than a formal specification.
The second edition of the book is available online in electronic form:
On a Debian system the package
cltl will download a local copy of the HTML.
The following two Emacs packages let you lookup functions and variables.
cltl2.el by UtzUweHaus? provides a simple
cltl2-lookup for opening your web browser (the usual
browse-url) at the page for a function or variable. The package is included as an extra in the ILispMode distribution.
cltl2.el uses the online copy at CMU, but
cltl2-root-url can be set to a different location, including a local downloaded copy.
browse-cltl2.el by HolgerSchauer? does the same sort of thing, using
browse-url to goto a function, or to go to the book’s index. Some ILispMode hooks are included. The package can be obtained from the author at
The default is to look for a local copy under
/usr/doc/html/cltl but that can be customized or an online copy used.