To paraphrase from the "README" file for this information, this data is from PC disks made available by the Board of Governors and placed on the Internet by the Internet Multicasting Service (which, among other things, helped run EDGAR and the Internet's own "radio" show, "Geek of the Week."). Note the data has not be updated since 1993.
In general, the data is quite extensive and detailed. Most dates back a number of years. All is in ASCII form, but some of the columns widths are more than 80 characters and some of the names are less than intuitive. As always, be sure to read all the information provided in the various help files.
All data is in the "fed" directory. Quoting from the "README" file in that directory, the data is in the following directories:
flow Flow of funds tables
g_17 Industrial production and capacity utilization
g_17_his Industrial production and capacity utilization
h_3 Reserves of depository institutions
h_4_2 Weekly series on assets and liabilities of
large commercial banks
h_15 Selected interest rates
money Money stock measures and components
others Other Federal Reserve data tables
Each directory contains many files and some even contain other directories of data. In each, there are several compressed files in different formats (denoted with different filename suffixes) with that directory's files. Each directory also contains a file with information on the data in that directory (the names of these files vary).
gopher://town.hall.org:70/11/other/fed
ftp://town.hall.org/other/fed