My printer supports it. But I don't want A4, I want B4. This is because B5 is the perfect size for a booklet I'm working on, and B4 would let me print it and fold it. But I'm in the US and it's tricky ...

There are two major standard systems for paper in use around the world: a United States standard, based on traditional paper measurements in inches, and an international standard, which is based on ...