This is a good set of Acorn Manuals. There are three Welcome Guides, two sets of the Master Reference Manuals, three BBC User Guides and manuals for Teletext, Prestel, the Master 512 and the 6502 Second Processor.

The two Reference Manuals on the right have a glossier cover than those on the left.

If you look closely, you can see that each cover of the BBC User Guides is different. The two on the left are identical except for the BBC Owl logo.

Before I got these, the only copies of the Reference Manuals I had were printed out copies of scanned versions held in two bulky ring binders. I am going to enjoy referring to the real thing instead.