I can assure you the yellow wood in my pics is osage orange (Maclura pomifera). One reason it looks a bit like mulberry, is that osage and mulburry are related, they are both in the family Moraceae. The woods look similar to each other, and if you take a hand lens to a cross section of rings, they look similar there too. But osage is much harder, more homogeneous, and much yellower when freshly cut, only turning a darker brownish yellow after exposure to light and sun for a while. Osage is not native to the east coast... but was planted along roads and fields as a fence, and there are plenty of them here on the east coast now, as the huge seed pods (they look like greenish yellow brains, a bit bigger than a grapefruit) have seen to that. Don't have a pic of one at the moment, but you can easily recognize this tree, as it has a distinct furrowed bark with a yellow/orange inner bark, and prickly nasty foilage. Other than mulberry, don't think there are any other trees that have that bright yellow wood either.