One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Meerschaum". Encyclopædia Britannica (به انگلیسی). Vol. 18 (11th ed.). Cambridge University Press. pp. 72–73.
One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Meerschaum". Encyclopædia Britannica (به انگلیسی). Vol. 18 (11th ed.). Cambridge University Press. pp. 72–73.