John Warren (yours truly) has written the first history of the Poestenkill ­which flows through the center of Rensselaer County and enters the Hudson River at Troy, will offer a book talk and signing this Thursday (October 22nd, 6:30 to­ 8 pm) at the Rensselaer County Historical Society in Troy (57 Second Street, Troy). The event is free and open to the public. Copies of The Poesten Kill will be available for purchase at the event. The Poestenkill has been home to American Indians who hunted, gathered, fished and farmed along its shores, frontier Dutch farmers and traders, colonial tradesmen, merchants, millers, and lumbermen, and nineteenth century iron, steel, textile, and paper workers.