The interdependency of technology between cities, states and nation-states shouldn't be underestimated. How many books are available today that can describe how

The interdependency of technology between cities, states and nation-states shouldn't be underestimated. How many books are available today that can describe how to make a semiconductor? Will these books survive? How about the process to create pure silicon? Or the lithography necessary to create CPUs? And with multiple nuclear detonations, the likelihood of EMP effects is high; this will cripple civilization as much as any explosions or fallout. Sure, technology can survive; witness the gunsmiths in the Hindu Kush who can recreate a functioning Enfield rifle (or ak-47) from scrap metal. But the world would be set back at least 100 years or more, and much knowledge would be lost because of poor archiving, poor dissemination, and the death of experts who are invaluable.