ftp://ftp.swiss.ai.mit.edu/pub/  direct

[DIR]users/  direct  4124+ twin directories
[DIR]thinkpad/  direct  594+ twin directories
[DIR]t3.1/  direct  6 twin directories
[DIR]t/  direct  65535+ twin directories
[DIR]su/  direct  1298+ twin directories
[DIR]siod/  direct  661+ twin directories
[DIR]sicp/  direct  75 twin directories
7 B  2001-10-25scsh  3 mirrors
[DIR]scm/  direct  4821+ twin directories
[DIR]schmuse/  direct  3 twin directories
[DIR]scheme-to-c/  direct  5 twin directories
[DIR]scheme-reports/  direct  3 twin directories
[DIR]scheme-mail/  direct  3 twin directories
[DIR]scheme-library/  direct  3 twin directories
[DIR]scheme-editor-packages/  direct  3 twin directories
14 B  2001-10-25scheme-7.5  3 mirrors
14 B  2001-10-25scheme-7.4  3 mirrors
14 B  2001-10-25scheme-7.3  3 mirrors
[DIR]s48/  direct  4 twin directories
[DIR]pseudo/  direct  665+ twin directories
[DIR]pc-scheme/  direct  3 twin directories
[DIR]mit-scheme/  direct  926+ twin directories
[DIR]its/  direct  973+ twin directories
[DIR]butterfly/  direct  53 twin directories
[DIR]boxer/  direct  4 twin directories
[DIR]Thomas/  direct  32 twin directories
[DIR]6.003/  direct  6 twin directories
[DIR]6.001-fall91/  direct  3 twin directories
[DIR]6.001/  direct  7 twin directories