This computing book has a picture of Leonard Nimoy on the front, Dave could double the auction price by noting that!
http://m.ebay.com/itm/131437995440?nav=SEARCH
That isn't a "computing book", its a copy of an issue of Creative Computing magazine.
Creative Computing was one of the earliest and most influential magazines in hobbyist computing.
When I was originally researching SWTPC systems, they were in publication.
The issue's value is only increased by Nimoy's photo.
Its a neat piece of history.
And I second the opinion that it would be nice to preserve the Escom PPC documentation for the community.