I had actually looked for Walsh's book on Amazon (as you say, out of print -- ugh) or, failing that, some good excerpts thereof which mught be lurking in the recesses of GOOGLE, but hadn't found any.
If you should happen across any such nuggets from Walsh's book out there on the Web, I would of course be happy to read them. Thanks.
best, OP
Keep looking. The SSPX has a few pages up.
A better place to find any book that you may be searching for is abebooks.com. You can place a 'want' and they will search the lists of all of the used book stores in the western world for your book :o)