1990—Subsec. (d). Pub. L. 101–624 added subsec. (d).
1985—Pub. L. 99–198, in amending section generally, divided existing provisions into subsecs. (a), (b), and (c) and inserted references to software programs and electronic publications.
Section effective Dec. 22, 1981, see section 1801 of Pub. L. 97–98, set out as a note under section 4301 of this title.