• 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
• 4 · Society, Civilization, Culture
• 47 · crafts and industries
• 47G · building activities
• 47G2 · laying the foundations; trench
• 47G23 · earth moving techniques (~ building activities)

47G23(+2) · earth moving techniques (~ building activities) (+ labourers ~ crafts, industries, agriculture)