Those of us who know how Bethesda (and most companies) works, know that all screens we've seen in the preview come from a standard press package. Bethesda usually releases these to the public later on, but looks like they got beat to the punch, as someone forwarded the screenshot press pack to Duck and Cover. So we've seen all these before, but enjoy the quality.
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Link: Duck and Cover Fallout: New Vegas screenshots.
Link: ScrawlFX Fallout: New Vegas screenshots (mirror).
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Link: Duck and Cover Fallout: New Vegas screenshots.
Link: ScrawlFX Fallout: New Vegas screenshots (mirror).