To mark both the 50th and 70th anniversaries of "The Little Prince's" publication, the Morgan Library and Museum mounted major exhibitions of Saint-Exupéry's draft manuscript, preparatory drawings, and similar materials that it had obtained earlier from a variety of sources. One major source was an intimate friend of his in New York City, Silvia Hamilton (later, Reinhardt), to whom the author gave his working manuscript just prior to returning to Algiers to resume his work as a Free French Air Force pilot. Hamilton's black poodle, Mocha, is believed to have been the model for the Little Prince's sheep, with a Raggedy Ann type doll helping as a stand-in for the prince. Additionally, a pet boxer, Hannibal, that Hamilton gave to him as a gift may have been the model for the story's desert fox and its tiger. A museum representative stated that the novella's final drawings were lost.