Birch, Robin.         frey50        <br/><br/>
Hard-headed dinosaurs / 
by Robin Birch. 
 - Philadelphia :  Chelsea Clubhouse Books,  c2009. 
 - 32 p. :  col. ill. ;  21 cm. 
 - Dinosaur world .
 - .
<br/><br/> Includes index. 
<br/><br/>Dinosaurs -- Hard heads -- Pachycephalosaurus -- Psittacosaurus -- Triceratops -- Styracosaurus -- Pachyrhinosaurus -- Names and their meanings. 
<br/><br/> Describes the appearance, eating habits, and habitat of hard-headed dinosaurs, including Pachycephalosaurus, Psittacosaurus, Triceratops, Styracosaurus, and Pachyrhinosaurus. 
<br/><br/><label>ISBN: </label>9781604134032 1604134038 
<br/><br/><label>LCCN: </label>2008000843 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ornithischia<br/>Ornithischians.<br/>Dinosaurs.
<br/><br/><label>Dewey Class. No.: </label>j567.914 Bir   25