Witschi, Emil,  1890- <br/><br/>
Development of vertebrates / 
Emil Witschi 
 - Philadelphia :  W. B. Saunders,  1956 
 - xvi, 588 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label> usd 8.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrates--Development<br/>Vertebrates--Embryology