Civilization manualBook 1: From Bare Hands to Steam and Electricity765 entries · 23 phases · 100 years
The Island
Phase 11 — Glass, chemistry, petroleum, rubber and cement  /  About year 29
11.44

Portland cement

MakingYear 29Stands on 150 earlier

AWhat it needs

Needs 150 other products in all, 5 of them directly.

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