bug#4973: 23.1.50; Please provide access to Emacs's quick reference cards on the Help menu

In 2007, at http://thread.gmane.org/gmane.emacs.devel/65537/focus=65629
, dak wrote:

> Maybe we should link to [the Emacs quick reference card] in some
> manner, like offering to call
> (shell-command
>   (format (mailcap-mime-info "application/postscript")
>      (expand-file-name "refcard.ps" data-directory)))

That's an excellent idea.  You should make the many quick reference
cards that you ship in emacs/etc/refcards accessible on the Help menu.
 Could you please do that?

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