Downloaded it, and read the first few chapters. It's good!
Unfortunately the formating, with the huge blueish-grey areas at the start of each chapter ends up using a lot of toner. I think that printing 2-3 copies will pretty well use up XL sized black and cyan toner cartridges - an expensive proposition.
Using a pdf editor program and eliminating those blueish-grey bars would save a lot of toner, but would be illegal.
As far as legality goes, just by utilizing the free download from DAN, we have become criminals:
© 2016 Divers Alert Network
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any
form or by any means, electronic, mechanical, photocopying, or otherwise without prior written permission of Divers
Alert Network, 6 West Colony Place, Durham, NC 27705.
2nd edition published September 2013; 1st edition published 2006.
Michael