John Aughanbaugh in Austrian pine plantation of McArthur Brick Company. Original stand - 590 trees per acre. 180 or 1/3 of stems removed (left on ground). In October of 1956, 410 trees per acre. Ave. 6.4 inches d.b.h. All trees pruned up first 6 feet with mall electric chain saw. Pruned up to 14-16 feet with ladder and carpenter's saw. Item #5695