Gregory, Philip Herries. <br/><br/>
The microbiology of the atmosphere 
[by] P. H. Gregory. 
 - 2nd ed. 
 - London,  L. Hill,  1973. 
 - xxi, 377, [7] p.  illus. (some col.), maps.  24 cm. 
<br/><br/><label>ISBN: </label>0249441101 
<br/><br/><label>Subjects--Index Terms: </label>Air--Microbiology Palynology 
<br/><br/><label>Dewey Class. No.: </label>576/.19/0961  / GRE