-r, --recursive specify recursive download.
-l, --level=NUMBER maximum recursion depth (inf or 0 for infinite).
-A, --accept=LIST comma-separated list of accepted extensions.
Keeping in mind that the files are linked to in the iFrame lists.cryolist.org/pipermail/cryolist-cryolist.org, the following command will produce the desired results:
wget -r -l1 -A "txt.gz" lists.cryolist.org/pipermail/cryolist-cryolist.org
-r switch makes download other resources that are linked to.
-l1 switch limits this to one level, i.e., if
page1 links to
page2 links to
unwanted.txt.gz, this file will not be downloaded.