HiGot this one in today's emails. Have asked if any other volume is available. EDIT - apparently it came from here The Second World War: Thematic Studies but I can not see it so I guess they rotate what is available.
I found the history of the Wallace bombs very interesting.
View attachment 858272
This and 'Armament' Volume II are both available on the RAF Air Historical Branch website as free downloads, along with much else, I have just checked. I presume you can access it from your location?
Mike