Mine is Mark Bittman's Kitchen Express. It leaves so much room for interpretation and I'm more of a "fly by the seat of your pants" cook than a "follow the recipe precisely" cook. Which is exactly why I can't bake to save my life!
Time's Cuisine of the World (or something like that), produced in the very early 80's - the Great Britain edition, which I cannot seem to find right now! The history and poetic essay-writing of the author make it a delightful read for me. Master is embarrassed by my obsession with 'old-style food' (he's English). He doesn't know about my Irish cookbook by Monica Sheridan - that's where I learned to make colcannon.