- ArchiefMG 146 - W.O. Kupsch fonds
- ReeksJ. Audio-Visual Materials
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- StukWOK 18-141 - Calcite, var.
- StukWOK 18-143 - Fluorite, Rosiclare, Illinois. Typical cleavage octahedra
- StukWOK 18-144 - Galena, Near Galena, Kansas. A group of cubic crystals
- StukWOK 18-145 - Gold, California. Heavy wire gold on milky quartz
- StukWOK 18-146 - Gypsum, var. Selenite, South Dakota. A "Fish-tail" twin
- StukWOK 18-147 - Agate, Brazil. Banded grey agate, crystalline quartz and amethyst
- StukWOK 18-148 - Quartz, var. Milky quartz, Curay, Colorado. A choice group of large milky white crystals
- StukWOK 18-149 - Quartz, var. Rock crystal, Little Falls, New York.
- StukWOK 18-150 - Quartz, var. Petrified wood, near Holbrook, Arizona
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