He documents nearly every stony coral that has been classified with a number of pictures showing how corals can look different in different areas of the reef (shelf, flats, etc.). He classified a good many of them himself. He's been instrumental in the whelks.aim page, so if you've ever gone there to check out coral ID's, this has them all. PLus he gives definitions of the terms that describe the types of strure within the corals to make grouping and lumping things for ID purposes. Every page has at least 2 pictures and we're talking three volumes of several hundred pages. Vol 1 is Family Acroporidea and the following volumes catalog the other stony Genus'. Incredible series...