bibl.zip troff files for SNOBOL4 bibliography correg.zip troff files for corrections to SNOBOL4 books s4bs.zip troff files for SNOBOL4 information bulletins s4d58.zip troff files for S4D58 s4ds.zip troff files for various S4Ds s4ns.zip troff files for various S4Ns http://www.cs.arizona.edu/icon/ftp/contrib/s4/