I see "A-D" meaning one side good one side sucks, and "INT" meaning interior. "DFP" probably means douglas fir plywood.
If you're down to the joists, that would be the structural subfloor. Did you have to cut it where it meets the walls, or were the edges accessible?
Look out for support at the edges of the sheets. They should be lying joist to joist on one axis, but on the other, either it should be tongue-and-groove, or there should be blockers present between the joists to screw/nail the edges down.