f That is, the red volcanic sand called puzzolana, much prized for making Roman cement.
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https://paperspast.natlib.govt.nz/periodicals/NZT19180516.2.5.1
Bibliographic details
New Zealand Tablet, 16 May 1918, Page 5
Word Count
15Page 5 Advertisement 1 New Zealand Tablet, 16 May 1918, Page 5
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