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| Description: Past and Future Use of Aggregate Our need for aggregate, especially crushed stone, is increasing rapidly. It is estimated that by 2020 we will be using more than twice as much as we did in 1960. Picture Stats: Views: 543 Filesize: 120.17kB Height: 1080 Width: 1325 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=20730 |