One way could be to save all the books to disc, and ensure that all the relevant metadata are available in the file name. Mainly title, series and authors, I would presume.
After that you can list the files and redirect the listing to a text file.
Import that text file into a spreadsheet program and edit the list into a batch file containing a series of renames that normalize the metadata.
Finally rename all the books and import into a new Calibre library, and use the new file names to set metadata.
Once you have titles and authors correct you should be able to allow Calibre to download other metadata and covers.
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