I picked up this guide near when it came out 2001 and at a time nearer to the infancy of the internet, before the wealth of information regarding "roots reggae" arrived online. Regardless of the Ska to Ragga survey, this guide appropriately centers on the gist and pinnacle of the definitive era of reggae, the latter half of the 1970s.
Interestingly the cover image, and seller to novices, is the picture of icon Bob Marley. The good thing that this guide will do for the reader concerning finding the music is that it will outline the basics of an essential roots reggae library, which in reality hugely transcends just the roots music of Marley and the Wailers, who were central popular figures from Ska through the Roots era.
I believe, if memory serves correct, that it also points out to the reader, how the music was served at the time and where to find it today on disc; the differentiation between the real Jamaician, Marley-and-gang music releases versus Island Records Rock-ified White Bread releases, which is important, etc. And I'm sure it explains in fair detail many ska, roots artists, singers, dub artists collectively, enough to "guide" you to a very respectable music collection inclusive and weighted appropriately towards the vast array of amazing and truly central roots artists, particularly roots-Jamaican from the period.
I am pretty sure that it goes so far, through "exploring" summary/highlight discographies, to provide or nod to some proper sociological and spiritual contexts for the music. And perhaps the guide does explain through its chronological survey the significance of Jamaican music circa 1974-1983, after which time musical themes popularly shifted far away from the roots musical message. I have explored this era comprehensively so I am hoping the above is true---must have been a reason I grabbed an additional copy back then as a loaner.
To get to the point: Good guide for anyone interested in a real understanding, overview and seeking a breadth of authentic roots reggae discographies. A guide that cannot get really get dated due to this finite classic period. Also, it does lightly touch on the UK scene that sprung as well (of which I know another guide might be needed, including for myself).
I have not explored the expanded or later additions of this guide that hopefully might showcase latter era 1988-contemporary roots artists, of which I have found but only deep, deep, deep into the underground and sporadically as Babylon pretty much controls the web now! I would hope that such further guides would not be polluted with undesirable connections to otherwise non-roots musical forms that have nothing really to do with this musical form presented here. Vital guide. Recommended to grab one used on the cheap at least. I have two, one for I and one for I.
Note: for supplementary free coverage online, to aid your exploration after absorbing this great 2nd edition guide, "a comprehensive and searchable database of Jamaican Roots Reggae Albums from 1970 to 1985." see the roots-archive.