Shell Union Oil Corporation <br/><br/>
Let's Collect Rocks and Shells  [electronic resource] / 
Shell Union Oil Corporation 
 -  Project Gutenberg,  2003 
 - Project Gutenberg  4768 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text 
<br/><br/><label>Subjects--Index Terms: </label>Shells -- Collectors and collecting -- Juvenile literature Rocks -- Collection and preservation -- Juvenile literature Shells -- Juvenile literature 
<br/><br/><label>LC Class. No.: </label>QL