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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 Statement on
Schedule 13D will, unless written notice to the contrary is delivered as
described below, be jointly filed on behalf of each of them, and (iii) the
provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934 apply to
each of them. This agreement may be terminated with respect to the obligation to
jointly file future amendments to such Statement on Schedule 13D as to any of
the undersigned upon such person giving written notice thereof to the other
person signatory hereto, at the principal office thereof.
IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing
Agreement as of the date set forth below.
Dated: December 22, 1999 WEDGE Energy Services, L.L.C.
By: /s/ Xxxxxxx X. Xxxxx, Xx.
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Name: Xxxxxxx X. Xxxxx, Xx.
Title: Secretary
Dated: December 22, 1999 XXXXX X. FARES
By: /s/ Xxxxxxx X. Xxxxx, Xx.
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Name: Xxxxxxx X. Xxxxx, Xx.
Title: Attorney-in-Fact
