[Edi]

One more helpful tip: If you need the numbers of items in a hurry, you can get them the same way you do the unit numbers. In a game where you've maxed out construction research and have mages that can forge most stuff, look up a mage that can forge what you want, select forge orders, take a look at the item in question and hit Shift-I, it'll give you the item number.

Edi