Family Tree of the National Park System; Eastern National Parks, Philadelphia, Pennsylvania, 1972 Mackintosh, Barry. The National Parks: Shaping the System
Winding Stair: Francis Bacon, His Rise and Fall (1976年) Growing Pains – the Shaping of a Writer (1977年) Enchanted Cornwall (1989年) 饥饿的山庄 (Hungry Hill,1943年)