Graff, Ludwig von,  1851-1924. <br/><br/>
[Collected papers, reprints, etc. on Turbellaria]. 

 - n.p.  v.d. 
 - v.  cm. 
<br/><br/><label>LCCN: </label>ltf96018346  
<br/><br/><label>LC Class. No.: </label>QL391.T9  / G5