I was at Rich Harvey's Pulp AdventureCon in Bordentown today and found this neat Ace Double. This double-sided paperback consists of two Philip Jose Farmer novels, The Mad Goblin (heavily influenced by Doc Savage) and, on the flip side, Lord of the Trees (the same story, but from the point of view of a character similar to Edgar Rice Burroughs' Tarzan of the Apes). These novels are a combined sequel to Farmer's delightfully strange novel A Feast Unknown. All three hail from the late 1960's and early 1970's. Like me, Farmer was a fan of Doc Savage and the pulps of the 1930's and 40's. This led me to read and admire some of his other works, including the Riverworld series, but that's another story. Meanwhile, at today's con, I filled in some holes in my Doc Savage collection. It was a lot of fun.