Valley Inspired Products, Apple Valley, Minn, has released 2007 Guide To Understanding Oxygen Conserving Devices. This book is intended to help users of oxygen conserving devices (OCDs) to understand performance variables that might impact effective therapy, including history of long term oxygen therapy, oxygen delivery fundamentals, methods of oxygen delivery, key issues in oxygen therapy, methods of Testing, 27 OCD product comparisons, tables and graphs, and a glossary of OCD terms. No products are endorsed. For more information you can contact Valley Inspried products at (952) 891-2330, or visit the company Web site: