TY  - BOOK
AU  - Koepf, Herbert. H.
AU  - Pettersson, B. O. D.
TI  - Bio-dynamic agrictulture: an introduction  
U1  - 630.58 
PY  - 1976///
CY  - New York
PB  - The Anthroposophic Press
KW  - Organic farming
N1  - Includes bibliographical references P.405-16
ER  -