• 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
• 45 · warfare; military affairs
• 45E · communication and transport

45E5 · military engineering ~ communication and transport

• 45E51 · improvised bridge, temporary bridge ~ military engineering