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The Natural Auxins of Roots by Prof H E Street
The Commercial Production of Silicones by Dr R A Gregory
Education and Technological Change by Prof J W Tibble
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able activity Africa animals appear applied areas Association atoms become British called cent complete concerned consider countries course direct discussion early economic effect electronic energy engineering evidence example experience fact field further give given growth human important increase industry interest kind knowledge known land less living London material means measure Meeting ment methods million nature observed obtained particular perhaps period physical plant Pleistocene population possible practical present pressure probably problems produced reaction reason recent region relation relatively remains schools scientific scientists shown social society species standard structure suggest technical theory tion United University whole