ftp://ftp.cse.buffalo.edu/pub/FreeBSD-Archive/old-releases/alpha/  direct

[DIR]4.11-RELEASE/  direct  35 twin directories
[DIR]3.4-RELEASE/  direct  32 twin directories
[DIR]4.2-RELEASE/  direct  30 twin directories
[DIR]4.10-RELEASE/  direct  27 twin directories
[DIR]4.3-RELEASE/  direct  27 twin directories
[DIR]4.9-RELEASE/  direct  29 twin directories
[DIR]5.2-RELEASE/  direct  34 twin directories
[DIR]6.0-RELEASE/  direct  270+ twin directories
[DIR]ISO-IMAGES/  direct  460+ twin directories
[DIR]4.4-RELEASE/  direct  23 twin directories
[DIR]4.6-RELEASE/  direct  23 twin directories
[DIR]4.6.2-RELEASE/  direct  26 twin directories
[DIR]4.8-RELEASE/  direct  29 twin directories
[DIR]5.0-RELEASE/  direct  30 twin directories
[DIR]5.2.1-RELEASE/  direct  49 twin directories
[DIR]5.3-RELEASE/  direct  58 twin directories
[DIR]5.4-RELEASE/  direct  81 twin directories
[DIR]4.5-RELEASE/  direct  22 twin directories
[DIR]4.7-RELEASE/  direct  27 twin directories
[DIR]5.1-RELEASE/  direct  59 twin directories