Gray, T.R.G. Williams, S.T. <br/><br/>
Soil micro-organisms 
/by T.R.G.Gray, S.T.Williams 
 - Edinburgh  Oliver & Boyd  1971 
 - viii, 240 p. 
<br/><br/><label>ISBN: </label>116169 
<br/><br/><label>Dewey Class. No.: </label>631.41  / GRA