For those that did not attend DEMA this year, PSI has introduced a new publication. This book "Compressed Gas Cylinder Codes and Markings" is a valuble resource to any individual inspecting cylinders. Inside you will find over 50 pages of cylinder markings, stamps, and testing information. Not only will you find the current Industry cylinder stamps, but you will also find marking going back over 50 years for those cylinders in industrial capacities that are still valid for use. Additionally, there are now 3 pages dedicated solely to the new UN Cylinders that are slowly making their way into the industry. This book is printed in a handy spiral bound format allowing it to sit flat on a workbench while one is working. This manual is perfect for the cylinder inspector, hydro tester, or first responder as a handy reference. This book can be purchased from the PSI-PCI website, http://www.psicylinders.com.