A chinese biogas manual: 
by Crook, Michael. 
 - London,  intermediate technology publications ltd,  1985. 
 - 135p. 
<br/><br/><label>ISBN: </label>0-903031-65-5 
<br/><br/><label>LC Class. No.: </label>TP 350   / .B87 1983 
<br/><br/><label>Dewey Class. No.: </label>TP 350 .B87 1983