IPMS
In 1962 the ILS was renamed the International Polar Motion Service (IPMS) and in 1988 the IPMS was discontinued when the International Earth Rotation Service commenced. During its history the ILS/IPMS provided valuable observations of polar motion which continue to be analyzed today. Information provided by http://igscb.jpl.nasa.gov/mail/igsmail/1998/msg00249.html
G - I