[ought-six]

I’ll check with the library for a hardback copy; if my local library doesn’t have any of them they can get them from other libraries, though it may take some time.

I’m old school: I like reading the actual books, not an on-line or PDF copy. I have some old book markers that I’ve had for around fifty years, handmade things from an old
girlfriend. Even my wife uses them!

[kiryandil]

Try a university library - that's where I first saw them.

I like the electronic copy for reference.

In the case of these, they're cost and space prohibitive in physical format.