WORLd Health Organization
The Global eradication of smallpox - Geneva WHO 1980 - 122 p.
9241560657
Smallpox
Smallpox eradication
616.912 / WOR
The Global eradication of smallpox - Geneva WHO 1980 - 122 p.
9241560657
Smallpox
Smallpox eradication
616.912 / WOR