I have the trade paperbacks of Dungeoneer and Blacksand, and Allansia is around here somewhere. I've got 3 different editions of Titan, 2 different editions of Out of the Pit, and the Arion edition of Advanced Fighting Fantasy. I've also got the Quest for the Crown of Kings (the source book, not just the gamebooks and spell book).There was also Dungeoneer, Blacksand and Allansia, the last of which covered outdoor adventures and even mass battles. The new Second Edition rules include the Heroes Companion, Blacksand and Beyond the Pit. I don't know of any other books that meet your description.
Heroes Companion is one that I want, and I was wondering if Beyond the Pit is just a new edition of Out of the Pit, or if it has all-new material. Ditto Blacksand; I need sources with good, readable maps, and if the new edition of Blacksand has new information, I'll get it.
If there was a source book for Khare, I'd get that in a heartbeat. I decided that my Sorcery! character was born in Khare, grew up, left, and was returning when the Crown was stolen. She turns out to be the best candidate available to get it back. The lack of official information and even much fan-written information (I belong to a couple of Yahoo! gaming groups and a Fighting Fantasy forum) means I've been making some stuff up myself, as to how that city is actually run.
One of the best pieces of advice I ever read in the various Dungeon Masters' guides was to consider what happens in the adventure's location when the adventurers are not there. It helps lessen the "WTH, that doesn't make any sense!" problem.