@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

<https://concepts.sagepub.com/social-science/concept/Copper_Age>
  skos:definition "The Copper Age, or Chalcolithic time period, generally refers to circa5000 BCE to 2000 BCE. This typology was initiated by Dane Christian Jurgensen Thomsen in 1807 as a three-age system of classifying human prehistory based on toolmaking technologies (i.e., Stone Age, Bronze Age, and Iron Age). These categories were later refined by John Lubbock in 1865. [Source: <a href=\"https://sk.sagepub.com/reference/anthropology/n194.xml\" target=\"_blank\" data-id=\"to-sk\">Encyclopedia of Anthropology; Copper Age</a>]"@en ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/archaeology> ;
  skos:prefLabel "Copper Age"@en ;
  a skos:Concept .

<https://concepts.sagepub.com/social-science/concept/archaeology>
  skos:prefLabel "archaeology"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/Copper_Age> .

<https://concepts.sagepub.com/social-science/concept/conceptgroup/concepts>
  a skos:Collection, isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member <https://concepts.sagepub.com/social-science/concept/Copper_Age> .