- N60 - Economic History: Manufacturing and Construction: General, International, or Comparative1
- N61 - Economic History: Manufacturing and Construction: U.S.; Canada: Pre-19131
- N62 - Economic History: Manufacturing and Construction: U.S.; Canada: 1913-1
- N70 - Economic History: Transport, International and Domestic Trade, Energy, Technology, and Other Services: General, International, or Comparative1
- N71 - Economic History: Transport, Trade, Energy, Technology, and Other Services: U.S.; Canada: Pre-19131
- N72 - Economic History: Transport, Trade, Energy, Technology, and Other Services: U.S.; Canada: 1913-1
- N82 - Micro-Business History: U.S.; Canada: 1913-3
- N90 - Regional and Urban History: General1
- N91 - Regional and Urban History: U.S.; Canada: Pre-19131
- N92 - Regional and Urban History: U.S.; Canada: 1913-1
- O00 - Economic Development, Innovation, Technological Change, and Growth2
- O10 - Economic Development: General15
- O10 - Economic development - General1
- O11 - Economic development - Macroeconomic analyses of economic development1
- O11 - Macroeconomic Analyses of Economic Development26
- O12 - Microeconomic Analyses of Economic Development4
- O13 - Economic Development: Agriculture; Natural Resources; Energy; Environment; Other Primary Products2
- O14 - Industrialization; Manufacturing and Service Industries; Choice of Technology6
- O15 - Economic Development: Human Resources; Human Development; Income Distribution; Migration9
- O16 - Economic Development: Financial Markets; Saving and Capital Investment; Corporate Finance and Governance10