Source: Derived From Series (Total Manufacturing And Trade Inventories) Plus Series (Total Manufacturers' Unfilled Orders Excluding Machinery And Equipment And Defense Products)
This NBER data series m05131 appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: m05131
Release: NBER Macrohistory Database
National Bureau of Economic Research, Ratio of Manufacturing and Trade Inventories Plus Manufacturers' Unfilled Orders, Total, Excluding Machinery and Equipment and Defense Products for United States [M05131USM144SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M05131USM144SNBR/, June 30, 2015.