Our stock is traded on the NYSE under the symbol NOG.

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2006

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2007

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4350 Baker Road
Suite 400
Minnetonka, MN 55343

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December 31st

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EQ Shareowner Services
Transfer Agent
1110 Centre Point Curve, Suite 101
Mendota Heights, MN 55120-4100

Call 1-800-401-1957

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Deloitte & Touche LLP
50 South 6th Street
Suite 2800
Minneapolis, MN 55402

Cawley, Gillespie & Associates, Inc.
13640 Briarwick Drive
Suite 100
Austin, TX 78729

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