Wassén, S. Henry. <br/><br/>
Anthropological survey of the use of south american snuffs. 

 - Washington-US :   Public health service,   1967. 
 - páginas 223-289 :   Ilustraciones blanco y negro 
 - Irregular 
 - (1967) 
 - Ethnopharmacologic anthropological survey of the use of south american snuff.Separata   .
 - Public health service. .