If you missed the boat with Benfool, I have a large quantity of caving publications (including many issues of Descent) which I'll be offering free on here eventually - with a suggestion of small donations being made to a particular charity which I'll leave up to you.
But I'll let Benfool have chance to clear his stash first . . .
Can do you a 47 and a 50 - so now you only need a couple. (No.1 is not so easy to find.)
Shall I leave them (parcelled up) at the compressor shed for you? (Might not be going there for a week or so though.)