Hey thanks for the replies.
I think I should've elaborated more. My intention was to get the libcs contained for different version 'numbers' of a certain linux distro. i.e. libc.a for ubuntu 7.04, 7.10, 8.04, 8.10 etc... I've followed your advice and was able to find different versions of *.a files for some distros, but other distros only contained the packages of the latest release. So I decided to download VMware images of different versions of all the distros on a site where they provide VMware images. Thanks for all the advice!