...A little soil lying on calcareous tufa, over a tract of several hundreds of miles, supports a vegetation of fine sweet short grass, and mopane and baobab trees... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...The points on which the streams of water fell arehollowed by its action, and the space around which the water splashed iscovered by calcareous tufa, deposited there by the evaporation of thesun...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...It establishes its burrow in a soft tufa, and directs it almost horizontally, hollowing it out in such a way that the axis of the hole makes a very small angle with the soil...
Frédéric Houssay 「The Industries of Animals」
...They are built of blocks ofred tufa, with facing of travertine...
Rodolfo Lanciani 「Pagan and Christian Rome」
...Itwas probably at first a natural spring gushing out of the tufa rock ofthe Palatine Hill, but being dried up, it became in later times alacus or basin artificially supplied with water...
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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