This is the official release of GRASS 4.1. Users unfamiliar with the structure of a GRASS release should read the overview provided in the document "Accepting Software into GRASS", which is located in the file src.defs.ps.Z under the dir- ectory grass/grass4.1/releaseInfo. The contents of this directory are: binary ..... contains compiled versions of GRASS 4.1 data ....... contains subdirectories of the Spearfish database (spearfish), the sample satellite imagery for Spearfish (imagery), and the the global database (world) related .... contains the GRASS 4.1 src.related directory source ..... contains the GRASS 4.1 src, src.alpha, src.contrib, src.garden directories Each subdirectory contains a compressed cpio archive that may have been split into several 1-megabyte files for ease of transfer. All files comprising an archive must be retrieved to successfully obtain the archive. Additionally, files must be transferred using the binary mode of ftp. Also within each subdirectory is a README file that explains how to unpack the archive. It is strongly recommended that the README file be retrieved and read before any of the files comprising the archive are retrieved.