Robert Webster

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Introductory gemology : a study of the identification of gemstones, pearls, and ornamental minerals

Robert Webster, Virginia V. Hinton, 1945 .

A Summary of the Research Thesis

Robert Webster, 1947 .

Threads: Their types and some of their characters

Robert Webster, 1971 .

Practical Gemmology - A Study of the Identification of Gem-Stones, Pearls and Ornamental Minerals

Robert Webster, 2013 .

Gems: Their sources, descriptions, and identification

Robert Webster, R. Webster, 1962 .

Ruby and Sapphire

Robert Webster, R. Webster, 1957 .