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Continue to ChatThe trip I made to Angola to study the prehistoric contents of the gravel beds as a means of deciding the age of the deposits and their economic potential was the first time prehistory had ever been used for such a purpose. - Louis Leakey from https://whatsmyquote.com/quote/the-trip-i-made-to-angola-to-study-the-prehistoric-contents-of-the-gravel-beds-as-a-means-of-deciding-the-age