Beton: Verskil tussen weergawes
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Etiket: 2017-bronwysiging |
Etiket: 2017-bronwysiging |
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Lyn 45:
* {{de}} [https://www.planet-wissen.de/technik/werkstoffe/beton_der_formbare_stein/index.html ''planet-wissen.de: Beton'']
* {{en}} [https://www.concretenetwork.com/concrete-history/ ''concretenetwork.com: Timeline of Concrete & Cement History'']
* {{en}} [http://concretecontractor.com/concrete-history/ ''concretecontractor.com: The History of Concrete'']
;Verenigings
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