This free e-book is 284 pages. It is in pdf format and has many color pictures, graphics, many useful information in different fields and has a good design etc. It is 43 MB . I have been checking the book and it looks OK to me.

http://www.globaled.org/announcement050227.php

The book is supposed to be a lesson material for teachers and therefore consisting of interesting and informative articles which are well organised in different topics.

What a brilliant resource absolutly free - whether you are a teach or not!