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Tech Level - Atomic Rockets

The role-playing game Traveller popularized the use of tech levels in 1977. The tabletop boardgame Civilization popularized the use of tech trees in 1980. And pretty much every 4x game uses tech trees, with the items accessed by investing in tech research.

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Text Only--Route 66: A Discover Our Shared Heritage Travel ...

Please note that this text-only version, provided for ease of printing and reading, includes more than 40 pages and may take up to 10 minutes to print.

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