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ICRF-Ext.1: First Maintenance and Extension of the ICRF 

The ICRF maintenance and extension catalogue ICRF-Ext.1 contains updated coordinates of the 608 ICRF extragalactic radio sources and of 59 new sources. The data added to the ICRF spanned December 1994 through April 1999 from both geodetic and astrometric observing programs.

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