A lifetime of books Children’s book author Jane Yolen. FILE PHOTO A book shelf in Jane Yolen's Hatfield home where she keeps the 400 books she has published over her 60 year career. Contributed photo/Heidi Stemple— A bookcase in Jane Yolen’s Hatfield home where she keeps the 400 books she has published over her 60-year career. Contributed photo/Heidi Stemple A book shelf in Jane Yolen's Hatfield home where she keeps the 400 books she has published over her 60 year career. Contributed photo/Heidi Stemple— A book shelf in Jane Yolen's Hatfield home where she keeps the 400 books she has published over her 60 year career. Contributed photo/Heidi Stemple—