Seidenberg, Roderick <br/><br/>
Posthistoric man :  an inquiry / 
by Roderick Seidenberg 
 - Chapel Hill :  University of North Carolina Press,  1950 
 - vii, 246 p. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Civilization<br/>Progress