The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth |
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addition aesthetic Africa agricultural alcohol algae algebra American animal associated become called central century changes coast common complex Congo consists contains continued countries crops culture dance defined developed drinking drug early East eastern effects elements equations European example exists experience expression extensive feet field Figure flow forest function given human important increased Indian influence known Lake land language later less linear live major means miles Mountains natural Nile North northern objects occur operations origin particular patterns period Persian plant polynomial population problem region relation represent result ring River social society soils South southern space species structure style theory tion traditional tribes United variety various vector West western widely writing