Ghobrial, William Naguib. <br/><br/>
Studies on symbiotic nitrogen fixation  [microform] / 
 دراسات على تثبيت النيتروجين تكافليا. 
William Naguib Ghobrial. 
 -  1981. 
 - 137, 4 leaves :  ill. ;  30 cm. 
<br/><br/>Thesis (Ph.D.)--Mansoura University, 1981. 
<br/><br/>Includes bibliographical references (leaves 118-137 ) 
<br/><br/><br/>Microfiche. <br/>Cairo, Egypt : <br/>ASUNET, <br/>3 microfiche : negative. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen--Fixation.<br/>Nitrogen-fixing plants.<br/>Rhizobium leguminosarum.