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**[publiclaboratory](https://groups.google.com/group/publiclaboratory)** - the main Public Lab list; if in doubt, post here! (1881+ members as of 2/4/2014)
**[grassrootsmapping](https://groups.google.com/group/grassrootsmapping)** - balloon and kite-mapping specific list. Lots of healthy overlap with **publiclaboratory** (859 members as of 5/2/2013)