Series Is Presented Here As Two Variables--(1)-- Original Data, 1913-1921 (2)--Original Data, 1918-1940. Source: Bls Bulletins And Letter Directly From Bls
This NBER data series m04123b appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04123b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wholesale Price of Gasoline, Pennsylvania Refinery for Philadelphia, PA [M0423BUS37980M264NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0423BUS37980M264NNBR, February 9, 2016.