Penn State Cooperative Extension – Chester County, and the International Society of Arboriculture – Penn Del Chapter will hold Advanced Tree Climbing at The Ridley Creek State Park, 351 Gradyville Road, Newtown Square, PA 19073, March 31, April 1- 2, 2011. This course has been designed for the experienced climber. You will need at least … Continue reading Penn St. course on tree climbing, March 31