Series Is Presented Here As Two Variables-- (1)--Original Data, 1913-1924 (2)--Original Data, 1922-1941. 1913-1923, Prices Of No. 1 Sheathing Common Boards, F.O.B. Mill In Washington, The First Of The Month For 1913-1917; For 1918 On, The Monday Average. Source: For 1913, Direct From Bls Price Study File; For 1914-1923, From Bulletins And "Wholesale Prices"; Other Data Direct From Bls.
This NBER data series m04139a appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04139a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wholesale Price of Douglas Fir Lumber for Washington [M0439AUS000WAM289NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0439AUS000WAM289NNBR/, November 25, 2015.