TY  - BOOK
AU  -  Cherret,J.M.
AU  -  Sagar,G.R.
TI  -  Origins of pest, parasite, disease and weed problem / 
U1  -  636.0896 CHE 
PY  - 1977///
CY  -  London : 
PB  -  Blackwel Scientific Publicatons, 
N1  -  Includes bibliographical references
ER  -