TY  - BOOK
AU  - EL-Zahaby,Helmy Sayed Ahmed
TI  - The role of some free-flying and migratory birds in the transmission of some
PY  - 1970///
KW  - Virus diseases
KW  - Transmission
KW  - Poultry
KW  - Diseases
N1  - Thesis (Ph.D )--Cairo University,1970; Includes bibliographical references (leaves 173-205); Microfiche; Cairo, Egypt; ASUNET; 4 microfiches : negative
ER  -