[–] MightyMong 2 pts (+2|-0) Concrete is only about 1/4 sand though. Concrete is only about 1/4 sand though. link [–] x0x7 1 pt (+1|-0) And skyscrapers are mainly steel structures. And skyscrapers are mainly steel structures. parent link
[–] x0x7 1 pt (+1|-0) And skyscrapers are mainly steel structures. And skyscrapers are mainly steel structures. parent link
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