al-Khidr, Muhammad Ahmad. <br/><br/>
Qadaya al-bi'ah wa al-talawwuth fi al-Yaman / 
Muhammad Ahmad al-Khidr. 
 - [Yemen] :  [Wizarat al-Ta'lim wa al-Tarbiyah],  1997. 
 - 288 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references (p. 283-288) 
<br/><br/><label>ISBN: </label> Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution--Yemen.