Palaeogeography, palaeoclimatology, palaeoecology 

 -  1970 
 -  7/2 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arsacid dynasty, 247 B.C.-224 A.D.--Congresses<br/>Iran--Antiquities<br/>Parthians--History, Ancient<br/>Romans--Middle East--History<br/>Rome--History--Empire, 30 B.C.-476 A.D.