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<!--  Round: 5156e412-cac4-4bf9-b0c2-37bd8e46f163 -->
<!--  Creation date: 2010-02-05T03:17Z -->
<!--  Copyright (c) 2005-2010 EDGAR Online, Inc. All Rights Reserved. -->
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        <link:definition>101 - Statement - Statement Of Income Alternative</link:definition>
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        <link:definition>102 - Statement - Statement Of Financial Position Classified</link:definition>
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        <link:definition>103 - Statement - Statement Of Financial Position Classified (Parenthetical)</link:definition>
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        <link:definition>104 - Statement - Statement Of Cash Flows Indirect</link:definition>
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        <link:definition>105 - Statement - Statement Of Shareholders Equity And Other Comprehensive Income</link:definition>
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        <link:definition>106 - Statement - Statement Of Shareholders Equity And Other Comprehensive Income (Parenthetical)</link:definition>
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        <link:definition>107 - Disclosure - Business Description</link:definition>
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        <link:definition>108 - Disclosure - Summary of Accounting Policies</link:definition>
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        <link:definition>109 - Disclosure - Charges and Credits</link:definition>
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        <link:definition>110 - Disclosure - Acquisitions</link:definition>
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        <link:definition>111 - Disclosure - Drilling Fluids Joint Venture</link:definition>
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        <link:definition>112 - Disclosure - Inventory</link:definition>
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        <link:definition>113 - Disclosure - Fixed Assets</link:definition>
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        <link:definition>114 - Disclosure - Multiclient Seismic Data</link:definition>
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        <link:definition>115 - Disclosure - Goodwill</link:definition>
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        <link:definition>116 - Disclosure - Intangible Assets</link:definition>
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        <link:definition>117 - Disclosure - Long-term Debt and Debt Facility Agreements</link:definition>
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        <link:definition>118 - Disclosure - Derivative Instruments and Hedging Activities</link:definition>
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        <link:definition>120 - Disclosure - Stock Compensation Plans</link:definition>
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        <link:definition>121 - Disclosure - Income Tax Expense</link:definition>
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        <link:definition>122 - Disclosure - Leases and Lease Commitments</link:definition>
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        <link:definition>123 - Disclosure - Contingencies</link:definition>
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        <link:definition>125 - Disclosure - Pension and Other Benefit Plans</link:definition>
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        <link:definition>126 - Disclosure - Supplementary Information</link:definition>
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        <link:definition>127 - Disclosure - Document Information</link:definition>
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        <link:definition>129 - Statement - Statement Of Income Alternative (Alternate 1)</link:definition>
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        <link:definition>130 - Disclosure - Common Domain Members</link:definition>
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