The Board of Selectmen recently completed the purchase of more than 8 acres off Dedham Street to preserve as natural, undeveloped open space for future generations, according to an announcement by the Dover Land Conservation Trust. The purchase was made possible with a $150,000 contribution from the town’s Conservation Commission, and a summerlong fund- raising effort by the trust, which provided $200,000 from its own reserves and donations. The purchase was the result of the coordinated efforts of selectmen, the Conservation Commission, and the land trust to quickly acquire the parcel, which had been put up for sale last spring. The land, known as the Brodie property, borders the Powissett Brook near its entry to the Charles River. It is primarily wooded, with old-growth trees, a small pond, walking trails and woods roads, and will become accessible to the public for hiking, horseback riding, cross-country skiing, snow-shoeing, fishing, and other nonmotorized recreational uses, according to the trust.