David, John. <br/><br/>
Hale and Bopp two guys make history / 
by John David. 
 - Florida :  Harcourt,  2005. 
 - 16 p. :  ill., col ;  20 cm. 
 - Science Leveled Library. .
 - Science Leveled Library. .
<br/><br/> Grade 3. 
<br/><br/><label>ISBN: </label>0153231602 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biography.--Juvenile Literature.