Bronze Working - - ; Bro
Currency \ - ; Cur
Trade \ CoL ; Tra
Banking \ Rep ; Ban
Economics \ Uni
The Corporation \ Ind ; Cor
Automobile Cmb Stl ; Aut
Mass Production \ \ ; MP
The Laser \ NP ; Las
---
Recycling Dem \
Environmentalism \ SFl


Ceremonial Burial - - ; Cer
Mysticism \ - ; Mys
Astronomy \ Mat ; Ast
Theory of Gravity \ Uni ; ToG
Atomic Theory \ Phy
Nuclear Fission \ MP
Nuclear Power \ E2 ; NP
---
Fusion Power \ Sup


Democracy Ban Inv ; Dem
Conscription \ Met ; Csc

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