National Geographic :  New Zoos-Taking Down The Bars; Saving Siberia´s Tigers; Northern California; Cyprus: A Time of Reckoning 

 - Washington :   National Geographic Society 
 - Mensual 
<br/><br/> INV. UNIV. 27828; INV. BIB. 26485 
<br/><br/><label>ISSN: </label>0027-9358 
<br/><br/><label>Standard No.: </label>DGR-M16217