September 26th, 2021 at 9:20PM
nemfrog: ““Large stones, with voids filled with medium sized stones surrounded by smaller stones and sand.” A treatise on concrete. 1911. Internet Archive ”

nemfrog:

“Large stones, with voids filled with medium sized stones surrounded by smaller stones and sand.” A treatise on concrete. 1911.

Internet Archive

(via nemfrog)

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