Aún no tenemos significados para "porous tufa".
1The vast deposits of porous tufa in the surrounding country are certainly evidences of former great eruptions from Mount Taal.
2The rock is partly calcareous, and partly of a porous tufa, but softer than that which I saw in the Houle.
3From hence we passed between the Tel Shiehhan and Tel Es- Szoub; the ground is here covered with heaps of porous tufa and pumice stone.
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