The complete source code and documentation (but not executables) is available by anonymous ftp at:
tierra.slhs.udel.edu [22.214.171.124] and life.slhs.udel.edu [126.96.36.199] the file: tierra/tierra.tar.Z
To get it, ftp to tierra or life, log in as user ``anonymous'' and give your email address (eg. email@example.com) as a password. Change to the tierra directory and get tierra.tar.Z, a compressed tar file. Be sure to transfer in binary mode. It will expand into the complete directory structure with the following commands (Unix only):
uncompress tierra.tar.Z tar oxvf tierra.tar
The source code compiles and runs on either DOS or UNIX systems (and some others). If you do not have ftp access, the complete UNIX/DOS system is also available on DOS disks with an easy installation program. For the disk set, contact the author.