How can I tell what OS is on some ext drives-without booting them?

Can anyone help me with this? I have several firewire and USB external hard drives that I have backed up or simply stored various versions of my Operating Systems over the years. I thought there might be an "easy" way to tell what's what without having to try booting up from each one. Sadly, I cannot locate a file or some clue on each that can tell me.
Anyone know of a way to do this? Thanks.

Navigate to this file on each volume:
HD > System > Library > CoreServices > SystemVersion.plist
Since you are running Snow Leopard, you can then "Quick-Look" its contents just by highlighting that file and pressing the space bar. The OS version number is the last line.

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