ftp.nice.ch/pub/next/science/mathematics/isetl-next.3.0.NI.bd.tar.gz#/isetl-next/doc

isetl.1
 

isetl.2
 

isetl.3
 

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.