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Prints Mailing Labels - very very cool. Saves you such a lot of time.
Other Tools
There are other mailing label tools, some paid, some free, some work with Dymo labels. I tried one that used old S-Controls that didn't work. I think this one is really easy and it's free.
Documentation
https://appexchange.salesforce.com/servlet/servlet.FileDownload?file=00P3000000P3R4eEAF
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