TY  - SER
AU  - Sheets, Payson.
TI  - Place and time in activity area analysis : : a study of elevatedcontexts used for artifact curation at the Ceren site, El Salvador
T2  - Revista del Convenio "Andrés Bello" ; 
PY  - 1998///
CY  - Madrid-SP : 
PB  - Universidad Complutense, 
ER  -