Freestone
Zell's Condensed Dictionary · 1879 · p. 20
(fre'stōn.) (Build.) Any soft stone which is susceptible of being worked for building purposes, by means of a mallet and chisel. [s. 385]
Bu kavram başka kaynaklarda da geçiyor
The American Dictionary and Cyclopedia (1910)
Chandler's Encyclopedia (1898)
Chamber's Etymological of the English Language (1895)
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