The Encyclopedia Americana, Volume 7Grolier, 1988 - Encyclopedias and dictionaries |
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Page 81
... advance and withdrawal of ice sheets could de- velop without having to assume that astronomical variations caused it . When a thick ice sheet spreads over a continent , it has sufficient weight -it is about one third as dense as rock ...
... advance and withdrawal of ice sheets could de- velop without having to assume that astronomical variations caused it . When a thick ice sheet spreads over a continent , it has sufficient weight -it is about one third as dense as rock ...
Page 303
... advance without ever having been European colonies . Others might have done the same - notably the countries of Islamic Africa and southern Asia - but it seems doubtful that the pre- colonial societies of sub - Saharan Africa and the ...
... advance without ever having been European colonies . Others might have done the same - notably the countries of Islamic Africa and southern Asia - but it seems doubtful that the pre- colonial societies of sub - Saharan Africa and the ...
Page 749
... advance of 132 % even though the number of farms and farmers had declined sharply . In that span of years the net value of farm products sold annually rose markedly from $ 2.5 billion to about $ 11 billion , or an expansion of 440 ...
... advance of 132 % even though the number of farms and farmers had declined sharply . In that span of years the net value of farm products sold annually rose markedly from $ 2.5 billion to about $ 11 billion , or an expansion of 440 ...
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