1988 - Let's Explore a River [Books for Young Explorers] (Other) ISBN-13: 9780870447464 ISBN-10: 0870447467 Genre: Children's Books ? 1985 - Explore a Spooky Swamp [Books for Young Explorers] (Other) ISBN-13: 9780870442636 ISBN-10: 0870442635 Genre: Children's Books 2 1984 - Small Inventions That Make a Big Difference [Books for World Explorers] (Paperback) ISBN-13: 9780870444982 ISBN-10: 0870444980 Genre: Children's Books ? 1983 - Giants From the Past the Age of Mammals [World Explorers] (Hardcover) ISBN-13: 9780870444241 ISBN-10: 0870444247 Genres: Children's Books, Teen & Young Adult 2 |