Webster, Robert
Practical gemmology : a study of the identification of gemstones, pearls, and ornamental minerals - 6th ed. - London NAG Press 1976 - 209p. : ill.
GEMMOLOGY
549.091 / W4
Practical gemmology : a study of the identification of gemstones, pearls, and ornamental minerals - 6th ed. - London NAG Press 1976 - 209p. : ill.
GEMMOLOGY
549.091 / W4