Modula-2 and the PDP-11

When looking round a second-hand bookshop yesterday, I found this book on Modula-2:

front cover

I seemed to remember that there was some connection between the PDP-11 and the Modula-2 programming language, so I took a chance and bought the book for £1.  I spare no expense on my computer history collection :-) Anyway, now that I've had a chance to check, I found this "The first Modula-2 compiler was completed in 1979 and ran on the DEC PDP-11" (taken from here).  So it does seem like a worthwhile addition to my collection of PDP-11 related objects.  This pleases me.

...and for the sake of completeness, here is the back cover too (even showing the original price tag):

back cover