The Encyclopedia Americana, Volume 8Grolier, 1985 - Encyclopedias and dictionaries |
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Page 37
... Origin . The origin of cosmic rays is one of the most fascinating problems in astrophysics . The historical name " cosmic rays " is perhaps mis- leading . That is , the radiation is probably not prevalent throughout the cosmos , or ...
... Origin . The origin of cosmic rays is one of the most fascinating problems in astrophysics . The historical name " cosmic rays " is perhaps mis- leading . That is , the radiation is probably not prevalent throughout the cosmos , or ...
Page 273
... ORIGIN AND CLASSIFICATION Although crustaceans have probably existed since the Cambrian period , about 600 million years ago , their origin and relationship to other arthropods ( insects , spiders , and others ) are ob- scure . The ...
... ORIGIN AND CLASSIFICATION Although crustaceans have probably existed since the Cambrian period , about 600 million years ago , their origin and relationship to other arthropods ( insects , spiders , and others ) are ob- scure . The ...
Page 510
... Origin of Species . " Darwin then set about writing what he called an " abstract " of his theories . This abstract , entitled On the Origin of Species , was published on Nov. 24 , 1859. It sold out immediately . It was followed by five ...
... Origin of Species . " Darwin then set about writing what he called an " abstract " of his theories . This abstract , entitled On the Origin of Species , was published on Nov. 24 , 1859. It sold out immediately . It was followed by five ...
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