Copyright info.

The copyright terms for the book, that is the text and images included in the downloadable PDF is as follows:

Copyright ©1946, 2006 the estate of R.W. Toms. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the copyright notice above and the title of the book appear, and notice is given that copying is by permission of the estate of R.W. Toms.

This covers all of the text and images that I have copied from the book into this website.