1 The pozzolana is the material required for building purposes, for admixture with mortar; and the sandpits are naturally excavated in the stratum which supplies it. [Please select]
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I am speaking of sand fresh from the sandpits. [Please select]
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In May, 1867, while excavating on the southern boundary line of the Cemetery of Callixtus, de Rossi found himself suddenly confronted with sandpits, the galleries of which came in contact with those of the cemetery several times. [Please select]
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But if there are no sandpits from which it can be dug, then we must sift it out from river beds or from gravel or even from the sea beach. [Please select]
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