Secret of the Andes by Ann Nolan Clark won the Newberry medal in 1953.
It follows a boy, Cusi, as he leaves his home high in the Andes mountains to learn the mysterious secret of his ancient ancestors. Accompanied by his pet llama, Misti, he slowly discovers the truth about his birth and his people's ancient glory. Now he must prove himself worthy to be entrusted with the fabulous secret from the past.
This edition is in good vintage condition. No dust jacket. First edition, 1952, Viking Press.