Search Results       Your search for [author]Challand, Helen J. Ph.D. returned 1 record.           Activities in the Earth Sciences. by Challand, Helen J. Ph.D.; Chicago: CHILDRENS PRESS, 1982. Subject: Astronomy -- Experiments -- Juvenile literature; Geology -- Experiments -- Juvenile literature. [1. Earth sciences -- Experiments. 2. Experiments]; Weather -- Experiments -- Juvenile literature.          Add to Book Cart Relevance: 30.54%