Basic Heraldry by Stephen Friar and John Ferguson A pretty good reference for heraldry, with a lot of history, and a section on charges, divisions of the field ect. near the end. I used it extensively in preparing my heraldry page, as well as a number of other sources.
	A Dictionary of English Place-Names by A. D. Mills A very interesting reference, giving place names, their meanings, origins and the older forms of spelling them.
	Pleasures & Pastimes in Medieval England A really interesting read, this book covers everything from architecture to gambling. A broad overview of what medival people did for fun. I mean they didn't really spend all their time fighting wars and going to church...