Dual Boot Display Question

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http://www.linuxquestions.org – Running Ubuntu 8.04 (Apr'08) and have updated a couple of times so that boot screen shows several versions of Ubuntu. I scroll up to the most recent one and press enter to load that version. My question is, can I safely remove the previous versions from the boot loader and just leave the most recent? Before doing so I wanted to ask and avoid any problems. I have been unable to find any documentation specific to this. Thanks. (HowTos)