Haeckel, Ernst . <br/><br/>
The Riddle of the Universe /  Textual Documents 
Ernst Haeckel. 
 - 1st ed. / 
 - London :  Watts & Co. ,  1904. 
 - xiii,140p. :  ill ;  21cm . 
<br/><br/>Index 
<br/><br/><label>Subjects--Index Terms: </label>Biology G-Biology 
<br/><br/><label>Dewey Class. No.: </label>574  / H 115 R