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The same is true for 45s, and 8-tracks, and cassette tapes, and LPs, and CDs, and DVDs, and mp3 players (and really, any kind of artifact).

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For a study we're doing on, say, the availability of music in rural locations during the 20th century, we'd like to know more about the deposits in these illicit junkyards.What this step does is create a visual representation of the qualities of the artifacts, and their co-occurrence at different junkyards.Notice that this figure does not mention what kind of artifacts we're looking at, it just groups similarities.Larger percentages of artifact types are illustrated with longer bar snippets and smaller percentages with shorter bar snippets.A good source of information about how to make charts in Excel is Ted French's Excel Chart Tutorial (for several different versions of Excel).Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented (most likely) by the Egyptologist Sir William Flinders Petrie in the late 19th century.

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