Some issues available via the Internet at the IRS web site. Address of latest issue as of 26 January 2024: http://www.irs.gov/pub/irs-pdf/f6252.pdf; current access is available via PURL.
Also available on CD-ROM: United States. Internal Revenue Service. Tax products CD-ROM.
Some forms and instructions available in: United States. Internal Revenue Service. Reproducible copies of federal tax forms and instructions.