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- Roseville Rock Rollers – The purpose of the Society shall be to bring together, in good fellowship, individuals who are interested in the earth sciences, the arts of lapidary and gemology, with the intent of furthering their knowledge, abilities and comprehension of those arts and sciences.
- GPAA River City Prospectors – Sacramento chapter of the Gold Prospectors Association of America (GPAA).
- North Hills Radio Club – The NHRC is an Amateur (Ham) Radio Club, affiliated with the ARRL, the national organization of Hams. NHRC was organized in 1957, and in 2007, celebrated 50 years. The Club name, North Hills, represents all communities in and near Northern Sacramento County, California.
- Invent Meetup Group – Meet with other Entrepreneurs, Inventors and Artisans to discuss, plan and build things to stimulate our minds, have fun and even make some money!
- RepRap / MakerBot Builders in N. California – For RepRap enthusiasts and builders. RepRaps, MakerBots and 3D printers use plastic filament to print. This is the future of home manufacturing.
- RepRap – RepRap is humanity’s first general-purpose self-replicating manufacturing machine.