TY  - BOOK
AU  - Hewitt, C. Gordon
TI  - Regulacions under the destructive insect and pest act: with instructions to importers and exporters of trees, plants and other nursery stock 
CY  - Ottawa
PB  -  Department of Agriculture
KW  - Arboles
KW  -  plagas
KW  - Viveros forestales
ER  -