Title from caption.
"Organized as a separate bureau on July 1, 1931 ... The beginnings ... were laid in the initiation of irrigation investigations by the Office of Experiment Stations in 1898 ... Research in land drainage was begun in 1902 ... Transferred to the Office of Public Roads in 1915, along with farm-machinery studies begun in the Office of Farm Management a few years previously."--P. 1.
Continued in part by: United States. Bureau of Agricultural Chemistry and Engineering. Report of the chief of the Bureau of Agricultural Chemistry and Engineering.