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It is one of the most remarkable events in the history of life that the reptiles ( see REPTILIA ) , which flourished during the Mesozoic Era , declined at the end of the Cretaceous Period , and the dinosaurs became extinct .
During the period of the Great Proletarian Cultural Revolution ( 1966–1969 ) most traditional operas ceased to be performed in favour of new works , realistic in style and content , and using , paradoxically , Western musical ...
A nummun ber of groups become extinct in the period , including a Upper Devonian number of orthids and the pentamerids . Molluscan groups were well represented . The marine clams ( Bivalvia ) increased greatly during the period ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review