I believe that RowMan only compiled the first three discs and the fourth was made by Cowclops for the TR47 set (correct me if I'm wrong guys). I have an almost complete cover for the Holiday Special disc, a work-in-progress for the DefCol disc (both will be posted when complete). I was planning to do individual covers for Rowman's three-disc set, but since I keep them in 2-disc cases with my TR47 OT discs, I like ReverendBeastly's system. Anyhow, RowMan has nearly completed a new set, which is superior to the set listed above (and is the best extras set around IMHO), so you might want to wait...