Polly wrote: |
I keep meaning to ask my Dad about these. He was a Geigraphy teacher and I always assumed that he would know what they were or may have used them at school himself. |
Quote: |
I believe they are clear plastic sheets that can show a spread of information, such as popular, languages, race, or, for instance, the types of crops that are grown over an area. By placing one map over another on the page of an atlas or similar, it is possible to see if there is a correlation |
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