美国地质调查局国家矿产信息中心(USGS):2018年矿产品摘要报告(英文版)(204页)
Cover:AconveyortransportscrushedstonefromaquarrytoastockpileatanoperationinVirginia.Crushedstoneisusedinroadbase,asaconstructionaggregate,andforothermaterialsneededforinfrastructuredevelopmentandimprovement.(PhotographbyMichaelT.Jarvis,outreachcoordinator,anddesignbyGrahamW.Lederer,materialsflowanal...
2024-02-14
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