Well, the Import List plugin *might* have worked, except the CSV that I downloaded from Ravelry didn't have the details I expected it to. So, all I would have done was to create empty books that I would then have to connect to the PDFs manually.
If I do the entire thing (ugh!) manually, it's going to take me an eternity, but without a way to collect the information, it's the only method I can think of right now.
Thank you to those who stopped by with suggestions. I love the Calibre community -- y'all are always so nice!
Anne