https://ftp.pmel.noaa.gov/ferret/pub/ibm_aix/previous_versions
├── [ 28 Sep 14 2009] fer_environment.v61.tar.Z
├── [ 29 Oct 27 2009] fer_environment.v63.tar.gz
├── [ 28 Sep 14 2009] fer_executables.v61.tar.Z
└── [ 29 Oct 27 2009] fer_executables.v63.tar.gz
0 directories, 4 files