Technology recovery work as not really been formalized in either 3rd or 4th edition. The 4th edition does has an extensive section on building a city of a given tech level, but a few of us have tried to do that using those rules and find them cumbersome at best, incomplete and broken at worst.
If you want to try and use the ideas and tables in that section to make a recovery tree of some kind, I am sure there would be more than a few here interested in seeing the result.
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