Appropriations Subcommittee Structure: History of Changes from 1920 to 2017 [February 28, 2017] [open pdf - 518KB]
"This report details the evolution of the House and Senate Appropriations Committees' subcommittee structure from the 1920s to the present. In 1920, the House adopted a change in its rules to consolidate jurisdiction over all appropriations in the Appropriations Committee. After the enactment of the Budget and Accounting Act of 1921, the House reorganized its Appropriations Committee by establishing for the first time a set of subcommittees to consider appropriations bills based on the administrative organization of the executive branch. The Senate followed suit in 1922, and the two chambers have continued under that basic organizational approach since that time."
CRS Report for Congress, RL31572
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html