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Isaac Kremer/ January 14, 2018/
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A material, usually sand or gravel, this is mixed with water and cement to make concrete. Photo from The Cloisters, glossary/new-york/" class="glossaryLink" data-cmtooltip="1adc8ee834ec3189b4750f263dd91a57" target="_blank" >New York City, New York, 2019. (Walker, 1981)