"This is the first historical volume based on the 1972 Standard Industrial Classification (SIC) Manual. Previously published series, based on the 1967 SIC Manual, are not comparable to the series shown in this bulletin"--Caution page
Description based on: 1909/1970; title from volume title screen (Hein online, viewed Dec. 7, 2004)
Latest issue consulted: 1909/1978 (FRASER, viewed Mar. 28, 2018)