Buns of Stihl

I’m a little confused about the face and bush cord. Around here a cord of wood measures 4’X 4’ X 8’ amount of wood you get depends on the straightness and diameter of trees. I buy my wood by weight. A slightly over loaded full tandem hauls 6 cord green poplar for around $800. A bargain compared to hydro or oil if you don’t count your labour.