These are three ISO images of Slackware 7.1 as found on ftp.freesoftware.com. The 'install.iso' image is a bootable Slackware Linux installation disc, including everything except the bigslack/, contrib/, and source/ directories. (Actually, it's also missing the iso/ directory, for obvious reasons ;) The 'source.iso' image contains all of the source code from the source/ directory. The 'contrib.iso' image contains everything from the contrib/ directory, which is a collection of extra packages and source code. Note that these aren't exactly the same as the CDs sold by Walnut Creek CDROM (http://www.wccdrom.com). That's a 4 CD set that also includes BigSlack (a large .zip-based Slackware installation for FAT32), and some additional Linux archives from the Internet. If you'd like to help support the Slackware Linux Project financially, please consider purchasing the official 4 CD Slackware set from Walnut Creek. Enjoy, Pat