... Code 681, NASA/GSFC, Greenbelt, MD 20771 . IDL (Interactive Data Language) is a commercial plotting, image processing, and programming language that is widely used in astronomy. ... Therefore, in 1990 I created the IDL Astronomy User's Library (AUL), which is a collection of astronomy-related procedures written in the IDL language, available via anonymous FTP from idlastro.gsfc.nasa.gov . ... I then mention some additions to the IDL Astronomy Library since the previous report of Landsman (1993). ...