TY  - BOOK
AU  - Gäumann,Ernst Albert
TI  - Principles of plant infection: a text-book of general plant pathology for biologists, agriculturists, foresters and plant breeders 
U1  - 581.2 22
PY  - 1950///
CY  - New York
PB  - Hafner Publishing Co.
KW  - Plant diseases
KW  - Entomology
N1  - Includes bibliographical references and index
ER  -