Osborne, Mary Pope <br/><br/>
Dolphins at daybreak 

 - 1st. ed. 
 - United States of America 
 -  il. 
 - 1997 
 - Magic Tree House .
<br/><br/> It's sink or swim for Jack and Annie when the Magic Tree House whisks them off to the middle of the ocean. Luckily, they find a mini-submarine on a coral reef. Unluckily, they are about to meet a giant octopus and one very hungry shark. Will the dolphins save the day? Or are Jack and Annie doomed to be dinner? (Grade Level: 2 - 4) 
<br/><br/><label>ISBN: </label>9780590706353 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Children's Literature<br/>Imagination<br/>Action or Adventure<br/>Time Travel<br/>Teamwork