"Precious stones Pictorial works." . . "Precious stones." . . . . "Pictorial works"@en . "Guide In Color To Precious And Semiprecious Stones" . . . . . "A guide in colour to precious & semiprecious stones : by Jaroslav Bauer and Vladimir Bouska"@en . . . . . "Shows stones both rough and as jewelry, plus descriptions of more than seventy minerals."@en . . . "A guide in color to precious and semiprecious stones"@en . . "A guide in colour to precious & semiprecious stones" . . . . . "A guide in color to precious & semiprecious stones"@en . . . . . . "Minerals." . . "Gems." . . . .