POWER OF ATTORNEY
Published on December 20, 2007
POWER
OF ATTORNEY
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STATE
OF TEXAS
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§
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§
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COUNTY
OF DENTON
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§
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The
undersigned, W.C. Hammett, Jr. does
hereby constitute and appoint Charles R. Morrison or J. Kevin Bland as my true
and lawful attorney and agent, in the name of and in my place and stead, to
execute and file any and all Forms 3, 4 or 5 required to be filed on my behalf,
as fully and to all intents and purposes as I might or could do if personally
present, with full power of substitution and revocation, hereby ratifying and
confirming all that said attorney or substitute shall lawfully do by virtue
hereof.
This
power of attorney shall remain in
effect until specifically revoked by signed writing.
Signed
as of December 18,
2007.
s
W.C. Hammet,
Jr.
Signature
W.
C. Hammet,
Jr.
Name
Printed