• 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
• 47B · handicrafts and industries
• 47B2 · industries
• 47B21 · industries ~ metal
• 47B211 · iron and steel industry
• 47B211(+4) · iron and steel industry (+ materials processed ~ crafts, industries, agriculture)

47B211(+41) · iron and steel industry (+ metals, minerals ~ crafts, industries, agriculture)

• 47B211(+412) · iron and steel industry (+ base metals ~ crafts, industries, agriculture)