The citation is ambiguous. It may mean:
48 Stat. 993 (Pub. Law 73-393)
AN ACT To increase employment by authorizing an appropriation to provide for emergency construction of public highways and related projects, and to amend the Federal Aid Road Act, approved July 11, 1916, as amended and supplemented, and for other purposes - June 18, 1934 - 993
Link is to an internal page within a statute beginning on page 993.
You can view this U.S. Statutes at Large citation at these source(s):
48 Stat. 993
U.S. Statutes at Large
PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/48/STATUTE-48-Pg993a.pdf
also:
We also found 1 parallel citation: