At a Young 55 years old (in a couple days) this 1962 edition of The Light Princess
Illustrated by William Pene Du Bois (Samples below) is both vintage and representative of the
art of it's time.  
Some of you may know William from The Twenty-one Balloons or the lovely quote from that book
“Half of this story is true and the other half might very well have happened.” 
― William Pène du Bois, The Twenty-One Balloons