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Willbros Group, Inc.\NEW\ - FORM 10-Q - EX-32.1 - EXHIBIT 32.1 - November 9, 2010
Exhibit 32.1
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the quarterly report of Willbros Group, Inc. (the Company) on Form 10-Q
for the quarter ended September 30, 2010 as filed with the Securities and Exchange Commission on
the date hereof (the Report), I, Robert R. Harl Chief Executive Officer of the Company, hereby
certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:
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