Mary Wormell Related books Hilda Hen's Happy Birthday Harcourt Childrens Books • 1995 Hilda Hen's Scary Night Harcourt Childrens Books • 1996 Hilda Hen's Scary Night Harcourt Childrens Books Hilda Hen's Search Harcourt Childrens Books • 1994 Why Not I Farrar, Straus & Giroux • 1957 Why Not? Farrar Straus & Giroux • 2000 Why Not? Farrar Straus & Giroux • 2003