For the moment I've put a manual that can be freely 'handed out', if it's nonprofit. The manual is Tricky C by Barninga Z.
Copyright © 1994-1998 Barninga Z! The reproduction, by whatever means, of this book or its parts is freely permitted to natural persons, provided that is non-profit. The natural persons, as well as corporate bodies, in case they act for profit purposes, they must pre-emptively obtain written permission from the author. To the same conditions is allowed using and reproducing source and compiled files stored in the floppy disk enclosed in this book. All marks and brands cited in this book and in the floppy disk sources are deposited or registered trademarks of their respective owner.
This manual could be considered obsolete if we look at the RAD environments and virtual machine based languages present today. In fact the author examines mixed C+assembly programming under MS-DOS. Nevertheless it's a milestone for hackers, geeks and funs, who want to have full control and understanding of the x86 architecture; from which, by the way, today's PC are based.
(Note: the manual is in Italian)
Download it
here 
.
