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It goes in the cracks between the grains of sand. A little bit of cement makes a lot of concrete. See?" Major Holt frowned. But he knew these four. "I see, but I don't understand." "You can weld metals together with powder-metallurgy powder at less than red heat. You can take steel filings for sand and steel turnings for gravel and powdered steel for cement " Joe jolted erect.
There will be action started at the Pentagon. When you came in I was arranging with the largest producers of powder-metallurgy products in the country to send their best men here by plane. They will start at once. Now I have to get in touch with some other people." Joe gaped at him. The major moved impatiently, waiting for Joe to leave. Joe gulped.
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