My friend, as someone who has been known to spend hours researching the most up-to-date Libs versions (it's part of my OCD), allow me to introduce you to this site:
http://amiga.foul.fr/index.php?p=Work%2FLibsAlso
this list was helpful when I was first getting started.
You can get partial version info from
SysInfo, however speaking from experience, the C:Version FULL command is going to be your new best friend.

I run modified libraries from THoR, Cosmos, and Peter K., among others, and definitely recommend them (am sure someone will chime in here about "blah blah unstable, blah-blah not Commodore original, etc." however they work fine for me... your mileage may vary

).
Also if you would like to compare version numbers of specific libraries, I am down for that game any day.
