• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 2 · Nature
• 25 · earth, world as celestial body
• 25D · rock types; minerals and metals; soil types
• 25D1 · rock types
• 25D13 · minerals and metals
• 25D13(...) · minerals and metals (with NAME)

25D13(LEAD) · minerals and metals: lead