Series Is Presented Here As Three Variables--(1)--Original Data, 1868-1892 (2)--Original Data, 1890-1912 (3)--Original Data, 1911-1957. The Series Includes Crude Rubber And Quayule Latex In Rubber Equivalent Is Included Throughout The Series. Source: Monthly Summary Of Foreign Commerce
This NBER data series m07044b appears on the NBER website in Chapter 7 at http://www.nber.org/databases/macrohistory/contents/chapter07.html.
NBER Indicator: m07044b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Crude Rubber Imports for United States [M0744BUSM149NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0744BUSM149NNBR, February 8, 2016.