3, pages 33–41; (3) James L. Marshall and Virginia R. Marshall (Spring 2003) "Rediscovery of the Elements: Riddarhyttan, Sweden," "The Hexagon" (official journal of the Alpha Chi Sigma fraternity of chemists), vol.
3, pages 33–41; (3) James L. Marshall and Virginia R. Marshall (Spring 2003) "Rediscovery of the Elements: Riddarhyttan, Sweden," "The Hexagon" (official journal of the Alpha Chi Sigma fraternity of chemists), vol.