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Welcome to Stony Kill Farm Stony Kill Farm Environmental Education Center is located on Route 9D in Wappingers Falls NY. The 750acre farm on the ancestral land of the Wappinger is the former homesite of the Verplanck Family and is owned today by the NYS Department of Environmental Conservation DEC and operated by Stony Kill Foundation. FARM HISTORY On July 23rd 1942 James DeLancey Verplanck and his halfbrother John Bayard Verplanck gave 754 acres of land that shall be forever dedicated to and used exclusively for agricultural purposes to the NYS Department of Education to be used as a teaching farm by SUNY Farmingdale. In 1973 the farm and land were transferred to NYS Department of Environmental Conservation.