Beton: Verskil tussen weergawes
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Etiket: 2017-bronwysiging |
Etiket: 2017-bronwysiging |
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Lyn 47:
* {{en}} [http://concretecontractor.com/concrete-history/ ''concretecontractor.com: The History of Concrete'']
* {{en}} [http://theconcreteprotector.com/history-of-concrete/ ''The Concrete Protector: The History of Concrete'']
* {{en}} [https://www.nachi.org/history-of-concrete.htm ''International Association of Certified Home Inspectors: The History of Concrete'']
;Verenigings
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