"Valiant Imperial Warriors 2200 Years Ago". A picture book on the Terra-cotta Warriors. With original autograph and seal of Yang Xi-An, one of the farmers who discovered the first Terra-cotta warrior. In English. Paperback. Flipped through once only. The autograph is behind the thin picture of Yang Xi-An in the second Carousell photo. The third photo shows my mother with the original discoverer of the Terra-cotta Warriors.