Note that Blackmoor is the setting of Judges Guild's "First Fantasy Campaign" supplement. I admit, I never managed to snag a copy (copies were going on eBay just a hair over what I was willing to pay, before they jumped to well over what I was willing to pay). It's a shame it wasn't one of the PDFs sold online.There is no sourcebooks done by TSR, and their is scant info except that which is dug up in in a series of Basic D&D modules and obscure references in other sourcebooks (of the latter two settings).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.