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People concerned about the Malden River will meet with developers and planners this week to discuss efforts to protect and preserve key riverfront parcels. Friends of the Malden River will meet with John Preotle, a developer and real estate investor who has been responsible for multiple projects in Malden and Medford, and Everett city planner James Errickson on Tuesday at 6:30 p.m. at Everett City Hall. The Friends of the Malden River are also expected to discuss future projects to be implemented during the next year.