If the cover page for volume 3 is not showing up, as it didn't show up for me when I uploaded it to Google Books, do this:
Open the file using a zip software, I use 7zip, navigate to OEBPS\Text\Cover.x html and open it using an editor like notepad. Remove this line " <span style="display: none">cover</span> ". Save.
This will make the cover page appear.
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