... We found a great number of wells in this tufa... 
David Livingstone 「Missionary Travels and Researches in South Africa」
... In passing along we see every where the power of vegetation in breaking up the outer crust of tufa...
David Livingstone 「Missionary Travels and Researches in South Africa」
...The Ue flows between high banks of a soft red sandstone streaked with white, and pieces of tufa...
David Livingstone 「Missionary Travels and Researches in South Africa」
...So thefire and the heat of the flames, coming up hot from far within throughthe fissures, make the soil there light, and the tufa found there isspongy and free from moisture...
Vitruvius 「Ten Books on Architecture」
...I found the mausoleum to consist of a series of chambersand approaches to them, excavated in the solid tufa rock, not unlikethe labyrinthine recesses of the catacombs...
Hugh Macmillan 「Roman Mosaics」
...15 bivouacked on the side of a traphill, among some fine oat-grass growing on calcareous tufa...
A C and F T Gregory 「Journals of Australian Explorations」
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