The Encyclopedia Americana, Volume 7Grolier, 1988 - 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 620
... natural resources for future generations . The central purpose of most conservation activity is the perpetuation of ... Natural Resources ? The earth's sur- face provides the stage for human life , and the useful elements of the natural ...
... natural resources for future generations . The central purpose of most conservation activity is the perpetuation of ... Natural Resources ? The earth's sur- face provides the stage for human life , and the useful elements of the natural ...
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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