The New Encyclopaedia Britannica: Macropaedia: knowledge in depth. 19 vEncyclopaedia Britannica, Incorporated, 1981 - Encyclopedias and dictionaries |
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Page 23
... important as dis- ease carriers ; cosmopolitan ; 3 families , Argasidae ( soft ticks ) , Nuttalliellidae , and Ixodidae ( hard ticks ) ; about 850 spe- cies . Order Acariformes ( mites ) Small to large in size ; generally weakly ...
... important as dis- ease carriers ; cosmopolitan ; 3 families , Argasidae ( soft ticks ) , Nuttalliellidae , and Ixodidae ( hard ticks ) ; about 850 spe- cies . Order Acariformes ( mites ) Small to large in size ; generally weakly ...
Page 170
... important items of the national product , accounting for about 50 percent of its total value . The total arable area has been calculated to be 19,892,000 acres ( 8,050,000 hectares ) . Since much of the land is arid or semi - arid ...
... important items of the national product , accounting for about 50 percent of its total value . The total arable area has been calculated to be 19,892,000 acres ( 8,050,000 hectares ) . Since much of the land is arid or semi - arid ...
Page 201
... important because of its use in the cement industry . Deposits are fairly widespread . North Africa is a particularly important source . In West Africa a belt of limestone runs from the Central African Republic to the Atlantic coasts ...
... important because of its use in the cement industry . Deposits are fairly widespread . North Africa is a particularly important source . In West Africa a belt of limestone runs from the Central African Republic to the Atlantic coasts ...
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19th century abrasive accelerator acid actinide actor Adams adhesives administrative adult advertising Aegean aerospace Aeschylus aesthetic Afghanistan agriculture aircraft airplane animals artist atomic Bantu Bantu languages basic behaviour Bronze Age Cameroon carved Central centre changes Chari-Nile languages coast Congo contains countries Cretan Crete crops cultural Cyclades dance Djibouti early East Egypt electrons engineering Ethiopia example farm feet figures flight Ghana important increase industry Kabul Kenya Khoisan Knossos known Lake land languages mainland major masks ment metal modern mountains Mycenae Niger Nigeria Nilotic northern organization oxidation particles patterns percent period plants political population production proton region River Sahara savanna sculpture soil solvent South Africa southern species style Sudan Tanzania temperature theory tion tons traditional tropical United usually West Africa western Yoruba Zaire