The Encyclopedia Americana, Volume 7Grolier, 1989 - Encyclopedias and dictionaries |
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Page 142
... natural gas sent their costs upward sharply . Under these conditions , interest in coal production and coal research ... natural gas resources began to be exploited rapidly . See also GAS , FUEL - Manufactured Gas and History of the Gas ...
... natural gas sent their costs upward sharply . Under these conditions , interest in coal production and coal research ... natural gas resources began to be exploited rapidly . See also GAS , FUEL - Manufactured Gas and History of the Gas ...
Page 619
... natural resources . Today , more than 75 minerals are used in significant quantities by modern in- dustry ; less than a century ago the figure was no more than 25. Moreover , the efficiency gained through large - scale mining operations ...
... natural resources . Today , more than 75 minerals are used in significant quantities by modern in- dustry ; less than a century ago the figure was no more than 25. Moreover , the efficiency gained through large - scale mining operations ...
Page 782
... natural fiber rope . NATURAL FIBERS They are classified as hard fibers and soft fibers . Hard fibers form the structural system of the plant leaf , and soft fibers are found in the inner bark ( bast layer ) of the plant stem . Abaca ...
... natural fiber rope . NATURAL FIBERS They are classified as hard fibers and soft fibers . Hard fibers form the structural system of the plant leaf , and soft fibers are found in the inner bark ( bast layer ) of the plant stem . Abaca ...
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