Richard,
You can download full (click on the book image) or plain-text (click the available link) versions
from this page. (You'll need to scroll down to get to anything "clickable".)
The representation there is that there are no copyright impediments.
Later Note: You may prefer
this site. The illustrations seem to come through more cleanly. Not a download, but you can print from the web pages.
It looks to be quite an interesting read. I see it on lists of "wanted" books, so it would likely be a challenge to get your hands on a hard copy. Not to worry. It looks like the print-out from the second-noted site comes in at a hundred pages (or less -- printer's still working) and a stop at Kinko's for a cover and binding package sets me up to go. Still much cheaper than finding a copy on a rare-books site.