I think I have completed - but remain perplexed. I've changed one letter, derived from interpreting the title, to produce
the name of the author of the second work but cannot see the connection (signalled immediately above) with the first work's creator.
Like others I dislike looking for misprints and cannot see the ones in 3 down (I had g for mag which seemed to fit well but was clearly wrong) and 23 down, if anyone can help.
However a good puzzle and, for me anyway, about the right level of difficulty. Mrs Seal said yesterday 'it keeps you amused but surely no-one will be on that forum today'. So thank you tatters and others..