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Thank you BetterRed, plus my apologies for not having understood your suggestion about "Finding Duplicates".
I have now run "Check Library" on all four of my Libraries.
Seemed to be quite a bit of deletion going on before everything was declared clean. Fortunately, the book counts all remained unchanged (also unequal).
What began the present kerfuffle was an accidental wipe of my main "D-drive' prior to doing a re-install of Windows 10 on my C-drive.
Most of that D-drive was re-instated from a backup copy.
But the backup appeared to lack some books from my Calibre_Library which was on D:\.
So what I'm really trying to do is to ascertain whether there are any books in any of my three backups of my Calibre-Library that are not on my present D:\Calibre-Library. Then import them into my D:\Calibre-Library.
I still cannot see how to do this.
As before, any suggestions will be received gratefully.
Basil
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