Practical gemmology : a study of the identification of gem-stones, pearls, and ornamental minerals /

Webster, Robert.

Practical gemmology : a study of the identification of gem-stones, pearls, and ornamental minerals / by Robert Webster. - 5th ed. - London : N.A.G. Press, 1973. - 209 p., [4] p. de lám. : il. ; 19 cm.

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671.15 549.091