EXHIBIT 99.3 JOINT FILING AGREEMENT The undersigned each agree that the Statement on Schedule 13D relating to the Common Stock, $.30 par value, of TGC Industries, Inc. is adopted and filed on behalf of each of them, (ii) all future amendments to such...Joint Filing Agreement • December 22nd, 1999 • Wedge Energy Services LLC • Plastics, foil & coated paper bags
BETWEENDebenture Purchase Agreement • December 22nd, 1999 • Wedge Energy Services LLC • Plastics, foil & coated paper bags • Texas
