I'm no expert, but my take on the situation is that those specific set of scans are "owned" by the University of California, and cannot be re-published.
However, if you've created a new copy of that public domain work, and merely proof-read it against those scans, then your book is yours to do with as you wish. I really wouldn't use the scanned cover, though, if I were you - that could get you into trouble.
Philosophically, though, I have to say this: you have used a public resource to create your book. Why not "give something back" to the eBook world and make your book available for free on MR, as so many other people have created books freely for your benefit?
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