This release of GRASS is GRASS4.1 and dates from May 1993 (4.1.0) with later updates. These files comprise the entirety of GRASS4.1.5 (src, src.alpha, src.related, src.contrib). They are generated from a compressed cpio file, split into 1-megabyte chunks. To use these files, acquire all of them. Then "cat" the files together, uncompress the combination, and un-cpio the archive: cat s5.cpio.Z.???? > s5.cpio.Z uncompress s5.cpio.Z cpio -icdu < s5.cpio In this way all appropriate subdirectories will be created. 2002: Note for Linux users: cat s5.cpio.Z.???? | zcat | cpio -id ... will extract the files.