John Sinkankas Related books Folksongs & Ballads popular in Ireland, Collected by John Loesberg Geoscience Pr • 1995 Gem Cutting Echo Point Books & Media, LLC. • 2020 Gemstone & mineral data book Collier Books • 1974 Gemstones of North America (V. 3: Gemstones of the World Series) Geoscience Pr • 1997 Mineralogy Van Nostrand Reinhold • 1976