Vaccination certificate requirements for international travel  
/ World Health Organization, Situation as on 1 January 1977  
 - Geneva:    World Health Organization,      1977 
 - 53p. 
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>Subjects--Index Terms: </label>International travel  
<br/><br/><label>Universal Decimal Class. No.: </label>615.371:910.4(100)  / L7