The great author-illustrator specified in his will that all of his ‘rare edition books’ go to the Rosenbach Museum and Library, part of the Free Library of Philadelphia. But the Sendak Foundation didn’t want to part with them (especially the ones worth millions), and two years of messy court battles ensued. At the end of last year, there was finally a settlement, and the Rosenbach’s share of the trove has now arrived. Peter Dobrin looks at what is (and isn’t) in it.