Appendix E, Classification of Industries by Major and Minor Industrial Groups

Walter A. Chudson, The Pattern of Corporate Financial Structure: A Cross-Section View of Manufacturing, Mining, Trade, and Construction, 1937 (NBER, 1945), https://www.nber.org/books-and-chapters/pattern-corporate-financial-structure-cross-section-view-manufacturing-mining-trade-and-construction/appendix-e-classification-industries-major-and-minor-industrial-groups.