Very rare; however, the quoted price to obtain a copy is only $125. Basically worth a modest night about town. A nice find, but not something to quit your day job over.
What you could do is to perform some high quality digitizing/photocopying. From that you would OCR and rebind it into an ebook (or present the photocopies to someone who knows how to do all that). Then upload it, preferably to a service that grants you credit for original uploads.
If you happen to be a writer, you might prefer to hang onto it for study. Keep it as a source of private inspiration. Save it for the grandchildren to cash in on.
Otherwise, to make something more out of this find you would have to speak to an experienced used book dealer.
Whatever you do, take your time and think it though. Do not rush into anything.
