Appendix A: Indexes and Values for Total Exports and Imports and Major Classes,1879–1960

Robert E. Lipsey, Price and Quantity Trends in the Foreign Trade of the United States (Princeton University Press, 1963), https://www.nber.org/books-and-chapters/price-and-quantity-trends-foreign-trade-united-states/appendix-indexes-and-values-total-exports-and-imports-and-major-classes1879-1960.