IFS documentation

These are the versions of the IFS documentation on the web

Cycle	Became operational on
38r1	19 June 2012
37r2	18 May 2011
36r1	26 January 2010
33r1	3 June 2008
31r1	12 September 2006
28r1	9 March 2004
25r1	9 April 2002
23r4	12 June 2001

For an index of model changes for each cycle since 18 July 1985 (Cycle 24) click here.