Klaus Dieter Hartwig (Klaus-Dieter Hartwig / Hartwig, Klaus-Dieter / Hartwig, Klaus Dieter)
English
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Gran Turismo 4 Official Guide
by Mathieu Daujam, Klaus-Dieter Hartwig
Softcover, Piggyback Interactive, ISBN 1903511747 (1-903511-74-7)
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Halo 2: The Official Guide
by David Hodgson, Klaus-Dieter Hartwig, Cora Tscherner
Softcover, Random House Information Group, ISBN 0761544739 (0-7615-4473-9)
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Halo 2: The Official Guide
by Klaus-Dieter Hartwig, James Price, Cora Tscherner
Softcover, Piggyback Interactive, ISBN 1903511682 (1-903511-68-2)
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Metal Gear Solid 3 - Snake Eater: The Official Guide
by Klaus Dieter Hartwig, Maura Sutton, James Price
Softcover, Piggyback Interactive, ISBN 1903511712 (1-903511-71-2)
German