Tamm, Carl Olof. <br/><br/>
Nitrogen in terrestrilal ecosystems  Questions of productivity, vegetational changes, and ecosystem stability 
by Carl Olof Tamm 
 - Berlin  SV  1991 
 - xii, 115p 
 - Ecological studies, 81 .
<br/><br/><label>ISBN: </label>354051807x 
<br/><br/><label>Dewey Class. No.: </label>574.52642  / N911