title: Matthew Guthrie (1743-1807): an eighteenth-century gemmologist.
authors.forename: J M
authors.initials: JM
authors.lastname: Sweet
mesh_terms: D005101:Expeditions / Q000266:history*; D049711:History, Modern 1601-; D012586:Science / Q000266:history*; D014195:Travel / Q000266:history*; D014586:USSR; D006113:United Kingdom