John,
This information was on IPC's web site.
http://www.ipc.org/html/revstat1.htm
IPC-ML-950
(obsolete)
uperseded by
IPC-RB-276
(also obsolete)
Performance Specification for
Rigid Multilayer Printed Boards
1/66 (org. pub.)
A 9/70
B 12/77
C 11/86
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