C — Mathematical and Quantitative Methods D — Microeconomics E — Macroeconomics and Monetary Economics F — International Economics G — Financial Economics H — Public Economics I — Health, Education, and Welfare K — Law and Economics L — Industrial Organization M — Business Administration and Business Economics; Marketing; Accounting N — Economic History O — Economic Development; Technological Change; Growth P — Economic Systems Q — Agricultural and Natural Resource Economics (general) Q — Agricultural and Natural Resource Economics (subcategories) R — Urban, Rural, and Regional Economics