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A volunteer pulls up overgrown blackberry plants in the Nichols Natural Area during a work party back in March. Volunteers are still needed to help with upcoming work parties on Sept. 25, 5-7 p.m. and Oct. 19., 9 a.m. to noon.

Columbia Riverkeeper invites the public to help with tree planting during fall work parties at the Nichols Natural Area on two dates in the next month .