1923 - 2016 Historical AISC Specifications

Historical AISC Specifications can be obtained here (they aren't free downloads, for non-members of AISC):

Some of these can be found out in the wild on the internet, but I'll not post links here as they don't appear to be in the public domain.

Historic Specifications for Structural Steel Buildings, AISC web site.

1923
1928
1934
1936
1937
1941
1942 War Production board emergency specifications
1946
1949
1961 - first appearance of C[sub]b[/sub], 6th edition steel construction manual, stays the same through the 9th edition steel construction manual (ASD)
1969 (AISC.org web site)
1970
1971
1978
1986 (1st LRFD)
[ul]
[li]Tide, Raymond H.R. (2001). "A Technical Note: Derivation of the LRFD Column Design Equations," Engineering Journal, American Institute of Steel Construction, Vol. 38, pp. 137-139 (as of 9/9/24 this is a free download).[/li]
[/ul]
1989
1993 (2nd LRFD)
1999 (3rd edition LRFD Steel Construction Manual) as of 5/28/24 a $10 download for non-members.(Note 6/29/24 - this is where the C[sub]b[/sub] that is not restricted to linear moment diagrams first appears).

A Historical and Technical Overview of the C[sub]b[/sub] Coefficient in the AISC Specifications, Zoruba and Dekker, AISC Engineering Journal, 3rd Quarter 2005 (as of 5/8/2024 free to download).

2005 (ASD/LRFD unified specification "thirteenth" Steel Construction Manual)

2010 - 14th edition Steel Construction Manual, Group A and Group B bolts (Steel Interchange, Modern Steel Construction, February 2014)

2016 - 15th edition Steel Construction Manual
(current is 2022 as of 5/1/2024)