Flames and Steel: The Chromatic War
Dragons and Other Races: A Comprehensive Study of Dragon Interactions with Other Races
This is a rare book of which only three copies were ever created. As the title suggests, this book covers the subject of relations between dragons and other races as well as what their more intimate interactions resulted in, half-dragons.
Of particular interest is the fact that the author, Aris Ashensoul, was a half-dragon herself.