Mostafa, Mahmoud Helmy. <br/><br/>
Effect of certain salts on the activity of azotobacter   [microform] / 
Mahmoud Helmy Mostafa. 
 -  1976. 
 - 119, 4 leaves :  ill. ;  30 cm. 
<br/><br/>Thesis (M.S.)-- Al-Azhar University, 1976. 
<br/><br/>Includes bibliographical references (leaves 87-103) 
<br/><br/><br/>Microfiche. <br/>ASUNET, <br/>Ain Shams University, <br/>2 microfiches : negative. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>azotobacter.<br/>Nitrogen--Fixation.<br/>Soils--Nitrogen content.