Three-age system (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Three-age system" in English language version.

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  • Kipfer, Barbara Ann (30 April 2000). Encyclopedic Dictionary of Archaeology. New York: Springer Science & Business Media (published 2000). p. 564. ISBN 9780306461583. Retrieved 29 January 2021. Three-Age system: The division of human prehistory into three successive stages - Stone Age, Bronze Age, and Iron Age - based on the main type of material used in tools of the period. [...] The Ages are only developmental stages, and some areas skipped one or more of the stages. At first entirely hypothetical, these divisions were later confirmed by archaeological observations.

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