I was lucky enough to do the two week course with CHL last year in penticton and was the only civilian on the course, the rest being Canadian military. For them it was one of the highlights of the their careers and all said how much their flying had improved on the course(multi thousand hour pilots).
They had no doubt done the military school of mountain flying ie. steep approaches above demarcation line etc. which I can understand in times of war maybe be better if you need to get machine down quickly and if you stack it you are just a battle stastitic. However, I am sure these guys were all converted to shallow approaches and all the techniques that go with it.
Just flicking through manual I was given which was obviously foundation for course. Table of contents reads: i)Geography of mountains ii)Mountain winds + weather iii)Illusions iv)Contour crawl v)Basic mountain reece vi)Circling Recce vii)Standard mountain approach, Landing + Take-off viii)Shoulders and ledges ix)High alt. ops + aircraft performance x)Ridges and crowns xi)Saddles xii)Cirques xiii)Glaciers and snowfalls xiv)Pinnacles xv)Alpine meadows + high alt confined areas xvi)Canyons, Dead-end valleys, and riverbeds xvii)Log pads and Platforms in Mountain confined areas.
As you can see it was a very thorough course and I havent seen any text book come close in going into so much detail. Also experiencing the sometimes stomach churning conditions mountains can throw at you with an instructor is far more advisable than trying it on your own after reading some handbook.
Interestingly on the course the only sites we aborted landings on were where updrafts were so strong we were unable to load the disc sufficiently to say we were in control of aircraft and attempting to land would have been dangerous. How would you deal with that Paco where a steep approach would initially load disc to arrest vertical descent after which you would almost be out of control.