puits (1) spectacle (1) besoin (1) marqueur (1) plomb (1) in situ (1) industrie (1) importation (1) exportation (1) économie (1) datation (1) ligne (1) point (1) campement (1) automobile (1) taux (1) profession (1) Dating (1) Observations (1) Observations (1) Imports (1) Space and time (1) Proportion (1) Persons (1) Organization (1) Occupations (1) Migration, Internal (1) Manufacturers' agents (1) Human beings (1) Lead (1)