1985 version (50 FR 52730, 12/24/85): two proposals, at 48 FR 40964, 9/12/83, and 50 FR 10734, 3/15/85.

1993 version (58 FR 36068, 7/2/93): two proposals, at 56 FR 9026, 3/14/91, and 57 FR 18296, 4/29/92.

1994 version (59 FR 37906, 7/25/94): proposed at 58 FR 477909, 9/10/93.

1996 version (61 FR 6428), 2/20/96): proposed at 60 FR 16970, 4/3/95.

2000 version (65 FR 77677, 12/12/2000): proposed at 65 FR 19933, 4/13/2000.