Poke around the Honeywell archives.  I believe that there was at least one implementation of QED and a runoff flavor that I saw.   As I believe Steve Johnson has mentioned,iIt was popular at Waterloo at one point - so check with the Waterloo folks. In fact, I had thought that Mike Malcom used it for Thoth, QNX's predecessor. 

On Tue, Sep 12, 2017 at 2:03 PM, Robert Swierczek <rmswierczek@gmail.com> wrote:

Does anyone know of the existence of source code written in B (C's predecessor?)

I have encountered a few snippets here and there, but nothing
substantial.  The only "real" program that I know of is AberMUD-1.  It
looks like there exists a physical print-out of it:

https://dropsafe.crypticide.com/article/12714

Could it be that this is the only artifact left of this most important
"missing link" of C and Unix History?  How can this (and any other B
source) be gathered and preserved?