Scientific American, Volum 235Munn & Company, 1976 |
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Side 31
... million in 1973 , some 23 million were poor ; call the remaining 187 million mid- dle - class . Let us try to find indexes that will provide a corresponding number for other countries . Passenger cars in use might be taken as roughly ...
... million in 1973 , some 23 million were poor ; call the remaining 187 million mid- dle - class . Let us try to find indexes that will provide a corresponding number for other countries . Passenger cars in use might be taken as roughly ...
Side 34
... million for the middle class in 1975 , a net natural - increase rate of .5 per- cent means three million children per year in excess of deaths . Apart from children who simply replace their parents or grand- parents , of the 20 million ...
... million for the middle class in 1975 , a net natural - increase rate of .5 per- cent means three million children per year in excess of deaths . Apart from children who simply replace their parents or grand- parents , of the 20 million ...
Side 168
... million hectares lie within the humid Tropics , 2,340 million hectares lie outside . Water is available to irri- gate another 80 - odd million hectares , which then can produce one crop a year . Omitting arable land for which no water ...
... million hectares lie within the humid Tropics , 2,340 million hectares lie outside . Water is available to irri- gate another 80 - odd million hectares , which then can produce one crop a year . Omitting arable land for which no water ...
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