Chronological designation changed from year of coverage to year of publication in 1928: 49th no. (1926) followed by 50th no. (1928).
Vols. for 1947- called 68th- ed.; issue for 2004/2005 is a combined issue.
Issued By
Vols. for 1878-1902 issued by: the Bureau of Statistics (Dept. of the Treasury); 1903-1911 by: the Bureau of Statistics (Dept. of Commerce and Labor); 1912-1937 by: the Bureau of Foreign and Domestic Commerce; 1938- by: the Bureau of the Census; <2000-> by: U.S. Census Bureau.