Maryellen: The One and Only, , Mattel Publishing, Valerie Tripp,Children’s / Teenage fiction: School stories,Children’s / Teenage fiction and true stories, 1950s; road trip; sisters; camping; science contest; polio; vaccine,, American Girl® Historical Characters, United States, en-UShttps://bookshop.org1950s; road trip; sisters; camping; science contest; polio; vaccine, [BLURB],[CITY],,books, ebooks, biblet, Book2look