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9780761525905
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Extensive stats for every military, experimental, and alien weapon In-depth walkthroughs for every alien-infested level Detailed maps of the Black Mesa Research Facility Developer's tips for single and multiplayer games Essential enemy and item information for your survivalPrima Publishing Staff is the author of 'Half-Life Opposing Forces' with ISBN 9780761525905 and ISBN 0761525904.
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