Appendix E: Relation of Frequency of Product Additions and Abandonments to Industry Characteristics, Product Additions and Abandonments Classified into Deciles on Basis of Six Variables, 1929–54

Michael Gort, Diversification and Integration in American Industry (Greenwood Press, 1962), https://www.nber.org/books-and-chapters/diversification-and-integration-american-industry/appendix-e-relation-frequency-product-additions-and-abandonments-industry-characteristics-product.