World Health Organization
Smallpox and its eradication - - Geneva W H O 1988 - 1460 p. 27 cm. - .
Smallpox
92 4 156110 6
Smallpox
WC588 / WHO
Smallpox and its eradication - - Geneva W H O 1988 - 1460 p. 27 cm. - .
Smallpox
92 4 156110 6
Smallpox
WC588 / WHO