The various agencies that use the
IHOG as a basis of operation have actually done a very good job on developing a broad and inclusive guide to all types of utility support operations. The other Chapters really offer a very comprehensive guide to every aspect of utility helicopter operations - and best still, they actually explain WHY you do things that mitigate risk and eliminate problems.
When you consider that the majority of personnel involved in these operations perform some other function for 97% of the year, and essentially know very little about helicopter operations, you must have a detailed system to train and operate from. The nice thing about the IHOG, is that not only does it provide practical real world advice, but it also forms the operational basis for every one of these functions. Better still, it's free!
There is a revision out, but it hasn't made it to the website yet - so keep an eye for an update.