• 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
• 25F · animals
• 25F7 · lower animals
• 25F72 · molluscs
• 25F72(...) · molluscs (with NAME)
• 25F72(OYSTER) · molluscs: oyster
• 25F72(OYSTER)(+3) · molluscs: oyster (+ anatomy of animals)

25F72(OYSTER)(+36) · molluscs: oyster (+ shell, snail-shell etc.)