Petry, M. J. <br/><br/>
Hegel's Philosophy of Nature 
/ by M. J. Petry 
 - London:  George Allen and Unwin Ltd,  1970. 
 - 392p.; 
<br/><br/><label>ISBN: </label>041000218 
<br/><br/><label>Dewey Class. No.: </label>113.2  / PET/H